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	<title>Thinking Diver &#187; Decompression Diving</title>
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		<title>Wreck of the Pinthis</title>
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		<pubDate>Thu, 21 Oct 2010 13:07:17 +0000</pubDate>
		<dc:creator>frenchguy</dc:creator>
				<category><![CDATA[Decompression Diving]]></category>
		<category><![CDATA[Trip Reports]]></category>

		<guid isPermaLink="false">http://www.thinkingdiver.com/?p=1186</guid>
		<description><![CDATA[Copied from my personal blog on Frenchguys.com I am always up for the deep, cold, long challenging dives. So when an opportunity came along to dive the wreck of the Pinthis, I jumped on it. The wreck is nearly 100 feet of deep freezing waters (barely hitting high 40s), a rough (flat seas) and long [...]]]></description>
			<content:encoded><![CDATA[<p><em>Copied from my personal blog on <a href="http://www.frenchguys.com">Frenchguys.com</a></p>
<p></em></p>
<p>I am always up for the deep, cold, long challenging dives.</p>
<p>
So when an opportunity came along to dive the wreck of the <a href="http://www.northernatlanticdive.com/shipwrecks/pinthis/pinthis.htm">Pinthis</a>, I jumped on it. The wreck is nearly 100 feet of deep freezing waters (barely hitting high 40s), a rough (flat seas) and long (40 minutes) trip from the (rich and prosperous) town of Scituate MA.</p>
<p>In any case, my buddy Sam and I drove down that morning of the fifteen of August, 2008, from Boston to Scituate. Sam was diving his Meg rebreather and I dove my O2ptima. We boarded Fran Marcoux&#8217;s excellent boat, the DayBreaker, in the Scituate marina.</p>
<p>Except for the fact that my VR3 shut down at 30 feet, the dive was pretty great, the weather gorgeous. The Pinthis is a great turtled oil tanker, which you can penetrate through and through. Plenty of cods inside, a few lobsters and large crabs as well as sunflower seastars. I also saw a very large flounder, not that Sam would care for he only loves rusting metal.</p>
<p>
The followin is my first attempt at taking a video of a boat dive and using my video lights so please be nice:</p>
<p><object width="501" height="338"><param name="allowfullscreen" value="true" /><param name="allowscriptaccess" value="always" /><param name="movie" value="http://www.vimeo.com/moogaloop.swf?clip_id=1540939&amp;server=www.vimeo.com&amp;show_title=1&amp;show_byline=1&amp;show_portrait=1&amp;color=00adef&amp;fullscreen=1" /><embed src="http://www.vimeo.com/moogaloop.swf?clip_id=1540939&amp;server=www.vimeo.com&amp;show_title=1&amp;show_byline=1&amp;show_portrait=1&amp;color=00adef&amp;fullscreen=1" type="application/x-shockwave-flash" allowfullscreen="true" allowscriptaccess="always" width="501" height="338"></embed></object><br /><a href="http://www.vimeo.com/1540939?pg=embed&amp;sec=1540939">Wreck of the Pinthis</a> from <a href="http://www.vimeo.com/frenchguy?pg=embed&amp;sec=1540939">Erik Dasque</a> on <a href="http://vimeo.com?pg=embed&amp;sec=1540939">Vimeo</a>.</p>
<p>
Note that the first song is an original sountrack that was written for my father&#8217;s underwater documentaries serie called &#8220;Le Monde sous le Masque&#8221;
</p>
<p>
If you&#8217;re a rebreather diver in new england, make sure to let us know and we&#8217;ll dive together !
<p>
Dive data:<br />
<b>Wreck of the Pinthis</b>, 08/15/08, AM, Fran Marcoux Daybreaker, departing from Scituate</p>
<ul>
<li>dive 1: 99 ft &#8211; 43 mins &#8211; 46.5 degrees</li>
<li>
dive 2: 100 ft ! &#8211; 39 mins &#8211; 46.5 degrees</li>
</ul>
<p>
I am copying here two comments made on the original post:
</p>
<blockquote><p><b>John Stull says on Tuesday, September 2nd, 2008</b>:<br />
Pretty eerie…my mother-in-law’s father was the captain of the Pinthis – died in this wreck when she was only 9 or 10. The first section was a bit long but I really like the music and the vivid colors…it would have been nice to have some narration of where you were in the wreck…but it surely would have ruined the mood.</p></blockquote>
<blockquote><p><b>Carol Phelan said on Tuesday, September 28th, 2010</b><br />
My grandfather, John Phelan, was the oiler and perished in this wreck. Chilling to see the silent beauty of the dive. Thank you.</p></blockquote>
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		<title>USS Monitor &#8211; 2009 Expedition</title>
		<link>http://www.thinkingdiver.com/uss-monitor-2009-expedition/?utm_source=rss&#038;utm_medium=rss&#038;utm_campaign=uss-monitor-2009-expedition</link>
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		<pubDate>Tue, 29 Sep 2009 15:19:54 +0000</pubDate>
		<dc:creator>frenchguy</dc:creator>
				<category><![CDATA[Decompression Diving]]></category>
		<category><![CDATA[Trip Reports]]></category>
		<category><![CDATA[Decompression]]></category>
		<category><![CDATA[NOAA]]></category>
		<category><![CDATA[Open Circuit]]></category>
		<category><![CDATA[Rebreather]]></category>
		<category><![CDATA[tech diving]]></category>
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		<category><![CDATA[trip report]]></category>
		<category><![CDATA[uss monitor]]></category>

		<guid isPermaLink="false">http://www.thinkingdiver.com/?p=914</guid>
		<description><![CDATA[My friend Rick Marshalls suggested I publish Robin&#8217;s great USS Monitor trip report on ThinkingDiver. I was all too happy to oblige. Photos and Story by Robin Jacoway As I waited for my luggage I began to realize that all around me were people from the military. I came from a navy town in San [...]]]></description>
			<content:encoded><![CDATA[<p>My friend Rick Marshalls suggested I publish Robin&#8217;s great <a href="http://en.wikipedia.org/wiki/Uss_monitor">USS Monitor</a> trip report on ThinkingDiver. I was all too happy to oblige.</p>
<h3>Photos and Story by Robin Jacoway </h3>
<p><img src="http://www.thinkingdiver.com/wp-content/uploads/2009/09/MonitorII.jpg" alt="USS Monitor on a rebreather" title="USS Monitor on a rebreather" width="350" height="232" class="floatleft size-full wp-image-917" />As I waited for my luggage I began to realize that all around me were people from the military. I came from a navy town in San Diego, but this was different. As I glanced around at the other passengers arriving and began noticing their local counter-parts it soon became apparent that this is a real military town. Then it dawned on me, not only was Norfolk an important base of operations for our country?s service men and women, but this was also the birthplace and backbone of our nation?s naval defense.</p>
<p>I arrived in Norfolk, VA at 11:00 pm, the first portion of my journey to join a team of divers whose destination was the USS Monitor. I was meeting Mel Clark, Curt McNamee and Judd Dunlap at the hotel. The plan was to get a good night?s sleep and drive to Hatteras, NC the next morning. We rented an F-150 crew cab truck, loaded it with all our gear and barely had a place to sit. If this truck veered off the road, it would cost more to replace the gear than the house it crashed into! We had three Digital SLR?s with UW housings, dual strobes, one HD video camera with UW lights,  four closed-circuit rebreathers, four laptops; oh yea,  lots and lots of other dive gear.</p>
<p>Looking at the map, Hatteras did not seem far away by car. As a matter of fact, many of the locals told us it only takes an hour and a half to two hours to get there. Four hours later we arrived and were greeted by Rick Marshall, diving legend Mike deCamp and his lovely wife Wesley.  Rick informed us that there was a group out diving that had been there the prior week and needed time to shower and get their things together before we moved into the house. So, what do divers do when not diving? We talked about diving, then started to put our gear together and formulate plans for the week.</p>
<p>A few hours later we joined the rest of the team for dinner at our second rented house. As we arrived Joe Dobarro and Tom ?Motz? Grothues, both from Rutgers University, were preparing the REMUS 100, an autonomous underwater vehicle (AUV). The REMUS 100 is very impressive torpedo shaped AUV, slightly less than two meters long, nineteen centimeters in diameter, and can dive to one hundred meters.  We were excited to hear Joe and Tom explain its new mission to map the Monitor in 3D, as well as collect other scientific data from the wreck site.</p>
<p>As we gathered for dinner I realized we really had a great team of people, each offering their own unique skills to help us achieve our goals.  Our first objective was to secure a mooring to the wreck, then assist REMUS in its mission, and finally take as many useful videos and still images as possible showing the current state of the wreck during our dives. If that was accomplished then we were to see if any voracious lionfish had made their way up the Gulf Stream to the Monitor, and document the quantity and location on the wreck site.</p>
<p><img src="http://www.thinkingdiver.com/wp-content/uploads/2009/09/Monitor1.jpg" alt="Diving the USS Monitor" title="Diving the USS Monitor" width="350" height="233" class="floatright size-full wp-image-916" />After dinner that first night we were advised of the following days plan. Dan Crowell and Bob Ryan were tie-in team one.  Their job was to find the existing mooring line and shoot the end of the line to the surface with a 250lb lift bag. Rick and I were on tie-in team two. We would either be finishing the job, or inspecting the tie-in points to make sure they were strong enough to handle the weight of our charter boat and the divers. The remaining divers would go to a local wreck to do a warm-up dive to make sure that their gear was ready to go for a deep dive to 240 fsw, with strong current likely.</p>
<p>Dan would also lead a production team in generating daily ?inews reports? that would be posted on the Monitor National Marine Sanctuaries web site titled ?Graveyard of the Atlantic Expedition 2009.?</p>
<p>Every dive trip has some type of drama, this one was no exception. Right after our first team meeting, Rick received a phone call from his wife, Romi. The adoption that he and Romi have been working towards for the past ten months was happening immediately and had to be on a plane headed to Alabama the next morning. The timing of this was unbelievable and bittersweet! Rick began to pack his dive and video gear, make travel plans and delegate duties in order for the expedition to move forward in his absence.</p>
<p><strong>Sunday at 6 am, Day One</strong>: Everyone was awake anxiously anticipating that first dive and what the Atlantic had in store for us. As I went upstairs to get my morning caffeine (ice cold diet coke) and breakfast bars, a few grumblings were heard about not everyone getting to dive the Monitor today. This passed as we realized one anonymous diver left several diet cokes in the freezer from the previous day. Frozen cans of soda eventually explode, an unexpected mess for our perpetrator to clean up. Needless to say, he took some kind ribbing from his peers that morning.</p>
<p>As I arrived at the ?OC Diver,? Captain Ted Green was assisting the REMUS crew to load the AUV and secure it to the boat for a rough-water journey. The rest of us loaded all of our gear on-board, including two large production quality SONY XD Cam cameras, two Amphibico Z7 underwater video systems, still cameras and lots of tackle to bring the REMUS back onto the boat.</p>
<p>The clear blue sky was misleading; as we pushed through the channel we could see the force of the colliding currents and why this area is known as the ?Graveyard of the Atlantic.?</p>
<p>It was a two-hour boat ride out to the wreck site of the USS Monitor.  Or at least to what we thought was the wreck site. We used the GPS coordinates given to us, only to find nothing but fish and sand, not even a bump on the depth finder! After ?mowing the lawn? for another hour, Ted and Dan?s Atlantic wreck diving experience paid off and we found the wreck.</p>
<p>The weather still looked good but the current was cooking. After Ted was assured he had the right hit for the wreck we went up current and drifted back in order to measure the speed of the current and to time how quickly we would be over the wreck.</p>
<p>Captain Ted made the decision that if we were to dive that day, it would have to be immediately and we would have to be sand darts in order to hit the wreck. We donned our gear; pre-breathed our rebreathers and got ready to dive. Ted put the boat into position and we stood on the stern, waiting for the command to go. As the boat got near the target Ted yelled ?dive, dive, dive!?</p>
<p>The three of us jumped in perfect syncopation and began our decent as quickly as possible. I descended with my hand on my diluent add button kicking down as fast as I could.  When we finally reached the bottom we could see the starboard side of the wreck faintly in the distance. As we swam closer we realized that we were very close to the armor-belt that the Navy divers had previously cut off in order to remove the turret during a prior Navy mission. The armor-belt was much larger than I imagined, coming several feet off the sand and fifty feet in length. We then swam against the current to the bow of the Monitor to look for the mooring line from the previous year?s expedition. We finally found it with some milk crates attached to a big tractor tire about fifteen feet off the port bow.</p>
<p><img src="http://www.thinkingdiver.com/wp-content/uploads/2009/09/MonitorIII.jpg" alt="USS Monitor Expedition, 2009" title="USS Monitor Expedition, 2009" width="267" height="400" class="floatleft size-full wp-image-915" />Our plan was a twenty-five minute bottom time with a ninety minute run time. Unfortunately, the mooring line was tangled throughout the wreck, and snarled into a large mass back to the armor-belt where we had first been. After twenty long minutes of untangling and freeing the line, Bob tied on the lift-bag and shot it to the surface. We had now been on the bottom for thirty minutes and were forced to use our longer contingency table.</p>
<p>This meant we needed to do almost ninety minutes of decompression with almost a two-hour run time. The current was quite strong on the bottom, which meant it was going to be stronger as we got closer to the surface. By the time I ascended to my forty-foot stop, I deployed my jon-line and clipped off. The water was stunningly beautiful, but it was much darker than when we started the dive. As I looked up I noticed the wave action; I could tell our surface support was not having a very good day above us due to the increased wave height and strong wind.</p>
<p>I had only completed half of my decompression when I looked up and saw rain pouring down onto the surface. By the time I arrived to the twenty-foot stop I could see the OC Diver clearly doing thirty degree rolls inside the troughs of the waves. You could almost see the crew looking over the side down on us. I felt very fortunate that I was down here instead of on the boat. As we climbed back aboard, the wind picked up to gale force strength and the rain pelted us from all sides. We tied two large mooring balls to the line and decided to just leave the lift bag there for the time being.</p>
<p>Our mission complete, the OC Diver finally headed back home with the storm at her back. When we returned to the marina, the rain had stopped, the wind had died down and the skies almost looked blue, but looks can be deceiving. After dinner we went online to investigate NOAA?s weather buoy located near the Monitor site. The storm front was going to build over a three-day period. With a poor weather forecast we decided we would cancel diving operations for Monday.</p>
<p><strong>Tuesday</strong> appeared to be another nice day, the storm front had subsided and we were going to make another attempt. Our team?s first priority was to get the REMUS into the water; if we could just get it to fly its mission we felt like we would have time to do more first-hand investigating on the Monitor as divers.</p>
<p>We deployed the AUV transponders; and quickly saw that the current was just too strong.  These transponders are how REMUS understands where it is in relation to the target so it can complete its 3D mapping mission. The combined weight of the mushroom anchors and extra lead were not enough to keep the transponders in a fixed position, a requirement for accurate mapping. </p>
<p>With the transponders dragging across the ocean floor, the REMUS mission was scrubbed. Between the current and the weather taking another turn for the worse, we reluctantly decided to cancel diving operations for the day. Though we were all disappointed, we knew it was the right decision to keep the team safe.</p>
<p><strong>Wednesday, Day 4</strong>: Once again we loaded REMUS and our dive gear, and then headed out. The sun was blasting down on us and there was just a light breeze. As we motored out, all of us had high anticipation and wondered if today was going to be the day we got to dive the Monitor. Shortly after getting out of the channel and into the open ocean we decided to do a test run with the REMUS. The transponders were deployed and once again we could see that they were going to bounce across the bottom with the strong current of the Gulf Stream. After recovering the transponders, we decide to go on to the site and just see what the weather might be like.</p>
<p>We radioed Captain Art Kirchner of the Margie II to advise the other dive team of our plans. Though all of us were afraid to get our hopes up too high, we were at least encouraged about the thought of going back to the wreck.</p>
<p>When we arrived it seemed relatively calm, only a slight breeze and very small waves. Ted motored up current from the target to check the speed of the current; it was 1.45 knots. It took about an hour for us to get the boat ready and the deco stations set up.</p>
<p>The plan was for Dan, Bob and me to do our dive, check the integrity of where the mooring line was chained to the tire, take video and stills, then shoot a bag; the signal that it was okay for the Margie II to send divers down.</p>
<p>Descending to the wreck I had made the mistake of not attaching my underwater camera to a leash.  I chose not to do this in order to protect the large dome port of the wide angle lens.  As I inched hand-over-hand down the traverse line going against the current it became increasingly difficult to both pull myself forward and hang onto my camera.  Ten minutes later I finally reached the down line at 100 fsw and began to relax again, and catch my breath.  Fifteen minutes going into the dive we finally had reached the bottom.  The dive seemed somewhat surreal, marine life passing by me in slow motion, the wreck a peaceful and quite setting, jacks darting about and sand tiger sharks wondering why we were there. The water was a beautiful blue, visibility was awesome, over 100 feet, and the water temperature a very comfortable 70 degrees.</p>
<p>I began moving from the bow to the captain?s quarters. Jeff Johnston of NOAA advised us to look for a PVC pipe that had sampling equipment in it.  I really wanted to find this and take a picture of it.  I knew the clock was ticking and couldn?t find it so I decided to move further aft clicking as many pictures of the bottom of the wreck as I could.</p>
<p>As I worked with the current amidships and then over the boilers and the engine frames I realized that my dive time was now twenty one minutes so I decided to start my slow swim against the current on the bottom on top of the port armor belt.  As I swam forward I noticed Bob heading back to the mooring line.  Dan had been shooting the port hull structure where the cement bags had been placed to support the hull structure from collapsing.  As I returned to the bow Dan swam up over the armor belt and then over the anchor compartment videoing everything for later analysis.   As I swam to the ascent line Dan swam past me and went off to the other tractor tire lying in the sand.</p>
<p>There was another tractor tire used as an old mooring an additional 30 feet from the port bow.  He turned, and then it was apparent to me what he was doing.  He was trying to get the whole wreck into the frame.  He glided quickly back to the mooring line and we both began our long ascent back to the surface.</p>
<p>Arriving at the first traverse-line at one hundred feet, I noticed Mel and Judd climbing down the mooring line. As I made my way towards the rear of the traverse line I realized my camera was going to be a liability as the current had picked up considerably since the start of the dive.  With one hand on my camera, and the other on the deco line, I had to figure out how I could free up my hands to relax. I could not release my grasp of the deco line for fear of winding up in the shipping lanes.  Finally, I decided to use the double-ender on my primary reel to attach a length of rope I had in my leg-pocket. Then I could attach my camera housing to the jon-line I was previously using. It worked, though my big YS-350 strobes blew-over to one side of the system, knocking against my body.  The camera was protected and the strobes trailed behind it, enabling me to free my hands and relax during my remaining hour of decompression.</p>
<p>As I ascended to my twenty-foot stop, I noticed more divers beginning their descent. One of them was having trouble going down and decided to take the traverse line to go back up the deco line, aborting their dive. The current made this a very challenging dive, but at the same time, very gratifying.</p>
<p><strong>Thursday, Day 5</strong>: We make another attempt only to find the current was now 2 to 2.5 knots. The two mooring balls were completely submerged below the surface, with no hope of popping to the surface. We radioed the other boat and advised them to change direction to an alternative wreck site. Since we were already there, we decided to jump in to cool off and maybe get some video footage while free diving near the NOAA weather buoy.<br />
<strong><br />
Friday, Day 6</strong>: This was our last day of diving operations. Reluctantly, we decided the weather is just too rough for the Monitor and make plans to go to another site, giving REMUS a chance to strut its stuff. When we arrive at the wreck we find a local charter boat, which we had radioed with our intentions as he passed us on our way out, tied into the wreck. We cannot safely conduct a REMUS mission with divers in the water, so we disclosed to him that we are going to a new secret NOAA target instead.</p>
<p>The explorer Bradford Washburn once told me that to go to the top of Mt. McKinley, or even Mt. Everest is a picnic, even a walk in the park, as long as the weather cooperates. It is the judgment of the explorer and his experience that keeps him alive. The lack of experience combined with the lack of good judgment is what gets people into trouble and ultimately a situation that they can?t overcome. I feel very fortunate to be associated with such an experienced team of people that showed good judgment and put the safety of the divers as its top priority. Dan, Rick, captains Ted and Art, safety divers John Billings and Karle Smith, and the rest of the team made this trip successful and fun. </p>
<p>As a team, we only did one dive on the Monitor, but it was a great dive. No one got hurt and we produced a lot of video and stills for NOAA to utilize in their assessments and for future site management. As for Rick, a new dad to a baby boy named Jack, he?ll be back next year. After all, the wreck won?t be going anywhere, and NOAA assured us access to the site would continue for divers.</p>
<p><strong>Robin Jacoway is a principal of <a href="http://www.deepoutdoors.com/">DeepOutdoors</a>, a California-based dive company specializing in equipment and diver and instructor-level training for advanced technical diving, including rebreathers and advanced trimix.</strong></p>
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		<title>Friendly Advice to a Lot of Young Men</title>
		<link>http://www.thinkingdiver.com/basic-beginner-learning-scuba-advice/?utm_source=rss&#038;utm_medium=rss&#038;utm_campaign=basic-beginner-learning-scuba-advice</link>
		<comments>http://www.thinkingdiver.com/basic-beginner-learning-scuba-advice/#comments</comments>
		<pubDate>Thu, 16 Apr 2009 15:06:14 +0000</pubDate>
		<dc:creator>frenchguy</dc:creator>
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		<guid isPermaLink="false">http://www.thinkingdiver.com/?p=830</guid>
		<description><![CDATA[So I was chatting with one of the guys that carpooled with me to Beneath the Sea (BTS) scuba tradeshow . He had been diving since 1960 when he was 16 and had a lot of good stories and advice. I thought I&#8217;d gather some good advice in this post, for the new, beginner scuba [...]]]></description>
			<content:encoded><![CDATA[<p>So I was chatting with one of the guys that carpooled with me to Beneath the Sea (BTS) scuba tradeshow . He had been diving since 1960 when he was 16 and had a lot of good stories and advice. I thought I&#8217;d gather some good advice in this post, for the new, beginner scuba divers out there. I am hoping most things are just plain obvious though some will be a matter of opinion/choice. I had a few discussions with my dive buddies and most agreed on these but there was some difference of opinion when it came to the Local Dive Shop (LDS) relationship (&#8216;dump them, they&#8217;ve priced themselves out of the running, they&#8217;re nothing but glorified travel agents and offer no real added value anymore&#8217;). Without further ado:</p>
<p><img class="floatright" src="http://www.frenchguys.com/gallery/albums/Themed/Underwater/TurkAndCaicos2002/crw_0060_std.jpg" alt="Bad habits are formed early" width="200" /><br />
? <strong>Select your Open Water instructor carefully</strong>. Talk to accomplished local divers and ask them for a recommendation. Agency doesn&#8217;t matter much as long as the instructor is good. Bad habits are formed early and so are good habits.</p>
<p>? If you are going to go to a resort to learn scuba diving, complete the theory &amp; pool classes with your local dive shop first and bring the paperwork to your resort diving center when you go on vacation. Do the open water dives there if you want but don&#8217;t waste time in a classroom or a pool while in some beautiful resort. If you can dive locally, by all means do your open water dives there. Local diving can be amazing.</p>
<p>? On that subject, it seems you can dive pretty much everywhere you live (I know, there are exceptions). There is always a mountain lake, a quarry or a local shore to dive at. Yes, local diving can be cheap, easy and rewarding. So <strong>dive locally</strong>!</p>
<p>? <strong>Forge a relationship with your Local Dive Shop</strong> (LDS). You might save some money buying gear online and sometimes your LDS will not carry the<br />
items but when the difference isn&#8217;t much, support your local brick and mortar shop. They will rent you tanks, fill your own tanks, provide advice, organize outings, service your gear later &#8211; they&#8217;re important.</p>
<p>? <strong>Meet local divers</strong>, mingle, learn from them. They know the spots, they know the tricks, they know the etiquette.</p>
<p>? <strong>CyberDive a bit but not to excess</strong>. There are many great online communities where to exchange ideas, buy and sell used gear, meet local and remote divers. Don&#8217;t become a couch diver though, do get in the water.</p>
<p>? <strong>Don&#8217;t rush your recreational scuba training</strong>. Yes, you can get your Advanced Open Water certification (or equivalent) right after your Open Water but why would you ? Enjoy your diving, build some experience before opening up to new challenges.</p>
<p>? Many many dives later, after you complete the Rescue diver class (or equivalent), don&#8217;t bother with any of the &#8216;specialties&#8217;. Besides Dry Suit training, there isn&#8217;t really much to learn in the PADI specialties that you can&#8217;t learn by diving.</p>
<p>? Dive Master training can be fascinating but understand what you&#8217;re getting into.</p>
<p>? Going past your No Decompression Limit into decompression diving, diving with a ceiling (virtual or physical) such as wreck penetration diving, cave diving, deco diving are <strong>tech diving activities</strong> that absolutely <strong>require the proper training</strong>.</p>
<p>? Pick up a copy of the <strong><a href="http://www.amazon.com/gp/product/B0000DYV1C?ie=UTF8&amp;tag=frenchguyscom-20&amp;linkCode=as2&amp;camp=1789&amp;creative=390957&amp;creativeASIN=B0000DYV1C">PADI Encyclopedia of Recreational Diving</a></strong>. It&#8217;s actually pretty good and contains most of the knowledge you&#8217;ll need in your recreational scuba activities.</p>
<p>? <strong>Prefer paddle fins to split fins</strong>. But that&#8217;s just my opinion. Buy a good mask as well. Later on buy a Buoyancy Control Device (BCD) and then a regulator.</p>
<p>? For BCD, don&#8217;t buy a jacket style, buy a back-inflated BC or a Backplate/Harness/Wing (BP/W) combination. The later is my preference and is likely to last you for a very long time. Find a used one, they&#8217;re just great.</p>
<p>? <strong>Learn the Frog Kick</strong> from the get go and forget about Flutter kick. You will not regret it.</p>
<p>? <strong>Focus on Buoyancy and Finning</strong>. Those are key skills.</p>
<p>? Do not get into the water without</p>
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		<title>Why a third computer ?</title>
		<link>http://www.thinkingdiver.com/three-deco-computer/?utm_source=rss&#038;utm_medium=rss&#038;utm_campaign=three-deco-computer</link>
		<comments>http://www.thinkingdiver.com/three-deco-computer/#comments</comments>
		<pubDate>Thu, 15 Jan 2009 14:05:48 +0000</pubDate>
		<dc:creator>frenchguy</dc:creator>
				<category><![CDATA[Decompression Diving]]></category>
		<category><![CDATA[Gear]]></category>
		<category><![CDATA[Techniques]]></category>
		<category><![CDATA[deco computer]]></category>
		<category><![CDATA[Decompression]]></category>
		<category><![CDATA[delta-p]]></category>
		<category><![CDATA[delta-p vr3]]></category>
		<category><![CDATA[dive computer]]></category>
		<category><![CDATA[dive rite]]></category>
		<category><![CDATA[dive rite o2ptima]]></category>
		<category><![CDATA[diverite]]></category>
		<category><![CDATA[liquivision x1]]></category>
		<category><![CDATA[O2ptima]]></category>
		<category><![CDATA[Rebreather]]></category>
		<category><![CDATA[shearwater]]></category>
		<category><![CDATA[shearwater pursuit]]></category>
		<category><![CDATA[tech diving]]></category>
		<category><![CDATA[vr3]]></category>
		<category><![CDATA[vrx]]></category>
		<category><![CDATA[x1]]></category>

		<guid isPermaLink="false">http://www.thinkingdiver.com/?p=721</guid>
		<description><![CDATA[People ask me why I use three computers on my rebreather. It&#8217;s a good question and frankly the decision is probably based on personal preference, careful planning, irrational fears and wrong assumptions. The default set up for my Dive Rite O2ptima rebreather is two Hammerhead handsets. The primary is used to drive the Solenoid (which [...]]]></description>
			<content:encoded><![CDATA[<p>People ask me why I use three computers on my rebreather. It&#8217;s a good question and frankly the decision is probably based on personal preference, careful planning, irrational fears and wrong assumptions.</p>
<p>The default set up for my Dive Rite O2ptima rebreather is two Hammerhead handsets. The primary is used to drive the Solenoid (which injects oxygen into the loop) and provides decompression information (Buhlman GF) as well as a read on the O2 Cells 1,2 and 3.<img class="ZenphotoPress_thumb ZenphotoPress_right floatright" alt="IMG_0039" title="IMG_0039" src="http://www.thinkingdiver.com/gallery/zp-core/i.php?a=posts/3computers&amp;i=IMG_0039.JPG&amp;w=300&amp;h=" /> The secondary is used to drive the Diva HUD (Head Up display with vibrating capabilities) displaying information from the same cells there as well as on its display. A lot of O2ptima divers dive their rebreather this way with one handset on each arm and the HUD.</p>
<p>Some choose to get the optional deco capability on the secondary handset, a $500 pin code from Hammerhead and a reasonably good choice which gets you a backup decompression computer should the primary fail (and you find yourself manually running your rebreather, using SCR mode or bailing out on Open Circuit).</p>
<p>The O2ptima has a neat feature which allows you to install a fourth sensor that can be read from a third party computer connected via a fisher cable. That&#8217;s what I was doing with some degree of success and failure with my VR3. This gives you a second deco computer, possibly a different deco algorithm and a fourth cell to get O2 readings from. Unfortunately a fourth cell can fail or behave erratically and as such I didn&#8217;t trust the VR3 as much as I would have wanted to. It also always seemed to be reading .10 higher than cell 1,2,3 which bothered me. One could also use a Liquivision X1, Shearwater Pursuit or Delta-P VRX with this scheme, reading from one sensor.</p>
<p>Having switched to the Liquivision X1 from the VR3 and following closely the announcements for the PPO2 interface, <img class="ZenphotoPress_thumb floatleft" alt="IMG_0036" title="IMG_0036" src="http://www.thinkingdiver.com/gallery/zp-core/i.php?a=posts/3computers&amp;i=IMG_0036.JPG&amp;w=200&amp;h="  />the X-Link, I have been working on a solution to connect three cells to a Fisher cable. Kevin from HammerHead set my head up with a split harness and 5 wires Fisher cable so I could continue monitoring Sensors 1,2,3 with the HammerHead handsets in addition to Sensors 1,2,4 with my Liquivision X1/X-link. Of course the same could be done with a Shearwater Pursuit or Delta-p VRX.</p>
<p>So what do I like about this setup ?</p>
<ul>
<li>O2 readings from 4 cells instead of 3 with voting logic on cells 1,2 and 4 for the external PPO2 reading
<li>Different software and hardware. If the HH primary handset was to freeze up due to an odd software issue (as opposed to electrical) it&#8217;s entirely possible the same thing could happen on my secondary. With the Liquivision X1, I am on a different hardware and software platform, one altogether different bugs maybe but _different_ is the key. Redundancy through additional and different hardware/software.
<li>VPM algorithm vs Bulhman GF. Always good to have two different profiles from two different algorithm
<li>Different voting algorithm on a different group of cells
<li>Possibility to fall back to 2 cell, one or constant PPO2 if I need to
<li>Very easy to configure the bailout gases (not that the HH or VR3 were that hard just not very quick to configure)
<li>Same deco computer, parameters, profile and as such deco plan as my usual dive buddy
<li>the X1 is very bright which is great for dark water diving (hello Boston). Also, I can see my buddy&#8217;s PPO2 from 10 feet away
<li>Same software for planning dives (V-planner) and diving those plans. Plan your dive, dive your plan
</ul>
<p>And while Fisher cables can be problematic, when well maintained they are reliable. <img class="ZenphotoPress_thumb floatright" alt="IMG_0041" title="IMG_0041" src="http://www.thinkingdiver.com/gallery/zp-core/i.php?a=posts/3computers&amp;i=IMG_0041.JPG&amp;w=300&amp;h="  />Now, I still have and use my two HammerHead handsets. With the secondary tucked away in a belt pocket, the HUD and primary remain my main dive instruments.</p>
<p>The Liquivision is a very good backup and could be the primary if I had a different setup (MCCR or OC, for example) and could be substituted by a Shearwater Pursuit or a Delta-p VRX. In addition to tables, of course and a deco plan written on white electrical tape.</p>
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		<title>Dive computers Reviews &#8211; Part Two &#8211; the Liquivision X1</title>
		<link>http://www.thinkingdiver.com/dive-computers-reviews-part-liquivision-x1/?utm_source=rss&#038;utm_medium=rss&#038;utm_campaign=dive-computers-reviews-part-liquivision-x1</link>
		<comments>http://www.thinkingdiver.com/dive-computers-reviews-part-liquivision-x1/#comments</comments>
		<pubDate>Fri, 05 Dec 2008 13:01:02 +0000</pubDate>
		<dc:creator>frenchguy</dc:creator>
				<category><![CDATA[Decompression Diving]]></category>
		<category><![CDATA[Gadget]]></category>
		<category><![CDATA[Gear]]></category>
		<category><![CDATA[deco computer]]></category>
		<category><![CDATA[Decompression]]></category>
		<category><![CDATA[decompression computer]]></category>
		<category><![CDATA[delta-p]]></category>
		<category><![CDATA[delta-p vr3]]></category>
		<category><![CDATA[dive computer]]></category>
		<category><![CDATA[liquivision]]></category>
		<category><![CDATA[liquivision x1]]></category>
		<category><![CDATA[product review]]></category>
		<category><![CDATA[Rebreather]]></category>
		<category><![CDATA[review]]></category>
		<category><![CDATA[tech diving]]></category>
		<category><![CDATA[vpm]]></category>
		<category><![CDATA[vr3]]></category>
		<category><![CDATA[x1]]></category>

		<guid isPermaLink="false">http://www.thinkingdiver.com/?p=572</guid>
		<description><![CDATA[Disclaimers A decompression computer is not a substitute for planning your dive and carrying decompression tables. Plan your dive, dive your plan and carry backups tables. I paid full price for my Liquivision X1 (bought it used off a bloke in Canada) but I will be getting a Liquivision X-link for 50% of the list [...]]]></description>
			<content:encoded><![CDATA[<p><strong>Disclaimers</strong></p>
<ul>
<li>A decompression computer is not a substitute for planning your dive and carrying decompression tables. <strong>Plan your dive, dive your plan and carry backups tables</strong>.</li>
<li>I paid full price for my Liquivision X1 (bought it used off a bloke in Canada) but I will be getting a Liquivision X-link for 50% of the list price because I am working on a 2 pager about using the X-link with a Dive Rite O2ptima for Liquivision.</li>
<li>My experience is with the X1 is only with the V-Planner Live software installed. This post relates to this particular configuration unless otherwise noted.</li>
</ul>
<h2>Experience</h2>
<p>When I bought my rebreather, I already had a Delta-P <a href="http://www.thinkingdiver.com/delta-p-vr3/">VR3</a>. In addition to that deco computer (which I bought the Trimix and Rebreather/PPO2 software pins for) my O2ptima comes with a  Hammerhead primary handset that&#8217;s deco-enabled (Buhlman GF). Having just spent so much money on <img class="floatright" title="Bright display" src="http://www.thinkingdiver.com/gallery/zp-core/i.php?a=posts/x1-review&amp;i=bright.jpg" alt="This is how bright the X1 display is !" />diving equipment I wasn&#8217;t looking to buy a new deco computer.</p>
<p>Six months later, my dive buddy Sam bought a Megalodon Copis rebreather. Since the basic Copis doesn&#8217;t come with a deco capable computer (really just a PPO2 display) he chose to buy the new  <a href="http://www.liquivision.ca/liquivisionx1.html" target="_blank">Liquivision X1</a>. At the time, not much was known about the X1 but he had seen me struggle with the VR3 and thought the user interface was awful. The idea of being able to chose which software to put on the X1 was attractive as was its user interface both in terms of tapping and screen display.</p>
<p>I actually didn&#8217;t think the X1 was a great choice for him at the time as the X-link wasn&#8217;t available (it still isn&#8217;t at the time of this writing but should ship mid-december 2008) so the X1 could only give him deco information based on a pre-set PPO2 as opposed to reading it real time the way my connected VR3 did. <a href="http://www.thinkingdiver.com/gallery/index.php?album=posts/x1-review&amp;image=P1010902.jpg"><img class="floatleft" title="P1010902" src="http://www.thinkingdiver.com/gallery/zp-core/i.php?a=posts/x1-review&amp;i=P1010902.jpg&amp;w=300" alt="P1010902" /></a>I thought this was especially true of a manual CCR like the Copis he bought. In any case, he loved his X1 and after diving a few times with him as my VR3 failed again and again I went ahead and bought a used (but never wet) X1.</p>
<div class="clear">
<p>Today I am really glad I made this choice. I have made <strong>23 dives and spent 30 hours in the water (saltwater dives from 20ft to 173ft) with the X1</strong>, had no issues with it and I must say I am loving it.</p>
<h2>V-Planner Live</h2>
<p>Sam and I have been planning our dives using the V-Planner software for a little while now. People have varied degrees of success planning a dive with V-Planner in a way that&#8217;s consistent to a VR3 (even a VPM enabled one). Also the VR3 is very very conservative and when I was diving it in conjunction with the X1 and the Hammerhead, the VR3 would always keep me in the water much much longer than any of the other two. As mentioned previously, the X1 comes with no software (but a simple Bottom Timer), you chose what you want to put on it. Two different programs exist for it. I bought <a href="http://www.hhssoftware.com/v-planner-live/" target="_blank">V-Planner Live</a> which gives me the exact same profile than V-Planner the desktop version. An alternative to V-planner exists in <a href="http://www.gap-software.com/x1.html" target="_blank">GAP X1</a>, based on Buhlmann GF (currently priced at ?80 &#8211; will eventually be ?120) but I have no experience with it. V-Planner Live on the X1 is extremely easy to use. The diver interacts with the computer by gently tapping it. While it can be odd at first, it becomes natural very quickly. The display is astonishingly bright and the V-Planner UI is very clear and shows on the small X1 screen all the information you need on a dive.</p>
<h2>Pros/Cons</h2>
<h3>Pros</h3>
<ul>
<li>Extremely clear and bright display</li>
<li>Choice of software and deco models</li>
<li>Small unit, easy to throw in your laptop bag</li>
<li>USB Connection and dive log transfer (PC only, I use VMWare Fusion on a Mac)</li>
<li>Support for the X1 and V-Planner live available on <a href="http://www.liquivision.ca/forums/" target="_blank">Liquivision Forums</a></li>
<li>On V-Planner Live, bailout gas and dive planning are very easy to configure. Bailout to OC is very easy to do.</li>
<li>Great UI with V-Planner combined with the great physical interface (tapping &amp; OLED screen) of the X1</li>
<li>V-Planner Live is updated often as is the X1 firmware and easy to upload on the X1</li>
<li>Integrated electronic compass (though I had difficulties with it)</li>
<li>PPO2 monitor available soon (Dec 2008) which monitors up to 3 O2 sensors (and CO2 when available)</li>
<li>Battery will hold charge for a week of diving in most cases</li>
</ul>
<p><object width="498" height="374" data="http://vimeo.com/moogaloop.swf?clip_id=2423264&amp;server=vimeo.com&amp;show_title=0&amp;show_byline=0&amp;show_portrait=0&amp;color=00adef&amp;fullscreen=1" type="application/x-shockwave-flash"><param name="allowfullscreen" value="true" /><param name="allowscriptaccess" value="always" /><param name="src" value="http://vimeo.com/moogaloop.swf?clip_id=2423264&amp;server=vimeo.com&amp;show_title=0&amp;show_byline=0&amp;show_portrait=0&amp;color=00adef&amp;fullscreen=1" /></object><br />
X1 Simulation Dive</p>
<h3>Cons</h3>
<ul>
<li>Wristband looks inadequate. I replaced mine with a depth compensating (found on the VR3 or Hammerhead handsets). DSS also makes a bungee mount for the X1.</li>
<li>Battery is potted in and as such not user replaceable. A replacement program exists but many are concerned by the long term impact.</li>
<li>In a humid environment the wet switches prevent the X1 from shutting down the display which can affect battery performance.</li>
<li>Pricey at US$1750 but similar in price to Trimix-enabled, constant PPO2 VR3. ShearWater Pursuit is $150 cheaper.</li>
<li>No dive planning feature in V-Planer Live</li>
</ul>
<h2>Liquivision X1 vs Delta-P VR3</h2>
<p><a href="http://www.thinkingdiver.com/gallery/index.php?album=posts/x1-review&amp;image=P1010907.jpg"><img class="aligncenter" title="P1010907" src="http://www.thinkingdiver.com/gallery/zp-core/i.php?a=posts/x1-review&amp;i=P1010907.jpg&amp;w=300" alt="P1010907" /></a></p>
<table id="box-table-a" border="0" width="480">
<tbody>
<tr>
<th></th>
<th>Delta-P VR3</th>
<th>Liquivision X1</th>
<th>Comment</th>
</tr>
<tr>
<td>Form Factor</td>
<td>Large, irregular shape, heavy</td>
<td><strong>Small, compact</strong></td>
<td>Smaller is probably better in this case since the screen is very readable</td>
</tr>
<tr>
<td>Battery</td>
<td><strong>User replaceable AA (kinda)</strong></td>
<td>Potted, Lithium, Rechargeable</td>
<td>All AA batteries do not work well in the VR3</td>
</tr>
<tr>
<td>Physical Interface</td>
<td>Buttons tend to stick. Long hold / Short Press</td>
<td><strong>Tap. Can be too sensitive and get selected by mistake</strong></td>
<td></td>
</tr>
<tr>
<td>Display</td>
<td>Readable, adequate</td>
<td><strong>Very bright</strong></td>
<td>Older eyes tend to prefer the color VR3 instead of the monochrome version</td>
</tr>
<tr>
<td>Deco Algorithm, Muti-gas</td>
<td><strong>Buhlman standard (VPM available with additional license purchase). Time tested implementation with great record. Trimix with additional software license</strong></td>
<td>VPM or Buhlman GF. Time tested in V-Planner but fairly recent in V-Planner Live. Trimix &amp; Nitrox.</td>
<td>VR3 is know to be very conservative, too conservative possibly</td>
</tr>
<tr>
<td>Support, firmware/software</td>
<td>No repair center available in the North America. Must ship to the UK. Firmware/software not user updatable. Health check with Firmware Update is $199.95 !!!</td>
<td><strong>Ship back to the manufacturer in Canada for any issues. Firmware/software is user updatable</strong></td>
<td>Of course what works for me in the US wouldn&#8217;t be ideal for a Europe or Asia based customer</td>
</tr>
<tr>
<td>Configuration of gases, bailout, dive parameters</td>
<td>Most difficult</td>
<td><strong>Very easy</strong></td>
<td>But some people don&#8217;t care about UI</td>
</tr>
<tr>
<td>Interface to computer</td>
<td>Antiquated software (no really, Windows 3.1 style), some can never get it working. Windows Only. Requires separate cable and license purchase</td>
<td><strong>Out of the box, USB. Windows only. Integrates with V-Planner family</strong></td>
<td>Being able to download your dives easily has become a requirement, I believe.</td>
</tr>
<tr>
<td>Rebreather usage</td>
<td>Fixed PPO2 (requires license purchase) or PPO2 monitor (One cell only, requires separate cable and license purchase)</td>
<td><strong>Fixed PPO2 or PPO2 monitor (3 O2 cells + 1 CO2 &#8211; requires purchase of X-Link module)</strong></td>
<td>The VR3 always read the 4th cell higher than the Harmmerhead read cells 1,2,3. Looking forward to monitoring cell 1,2,4 with the X-link module on the X1</td>
</tr>
</tbody>
</table>
<h2>Cost</h2>
<p>As we can see the cost of the X1 and VR3, set up for external PPO2 CCR VPM Trimix deco diving are very similar (and outrageous):</p>
<table id="box-table-a" border="0" width="480">
<tbody>
<tr>
<th></th>
<th>Delta-P VR3</th>
<th>Liquivision X1</th>
<th>Shearwater Pursuit</th>
</tr>
<tr>
<td>Base Unit</td>
<td>$1474</td>
<td>$1750</td>
<td>$1195</td>
</tr>
<tr>
<td>VPM</td>
<td>$290</td>
<td>$125 (V-Planner Live)</td>
<td>N/A</td>
</tr>
<tr>
<td>Trimix</td>
<td>$200</td>
<td>built-in V-Planner</td>
<td>$250</td>
</tr>
<tr>
<td>Download Support</td>
<td>$230</td>
<td>comes with unit</td>
<td>comes with unit</td>
</tr>
<tr>
<td>CCR (Constant PPO2)</td>
<td>$100</td>
<td>comes with unit</td>
<td>$250 *</td>
</tr>
<tr>
<td>CCR (PPO2 sensor support. no cable)</td>
<td>$225</td>
<td>$675</td>
<td>$250*</td>
</tr>
<tr>
<td><strong>Total for CCR setup</strong></td>
<td><strong>$2519</strong></td>
<td><strong>$2550</strong></td>
<td><strong>$1745 (No VPM, pre-configured)*</strong></td>
</tr>
</tbody>
</table>
<p>* Shearwater Pursuit is $1745 if bought pre-configured as Trimix w/CCR External PO2 Unlock</p>
<h2>Conclusions</h2>
<p>The Liquivision has performed flawlessly for me. <a href="http://www.thinkingdiver.com/gallery/index.php?album=posts/x1-review&amp;image=P1010910.jpg"><img class="floatright" title="P1010910" src="http://www.thinkingdiver.com/gallery/zp-core/i.php?a=posts/x1-review&amp;i=P1010910.jpg&amp;w=300" alt="P1010910" /></a>The combination of a great hardware platform with a great implementation of V-Planner on a dive computer is a killer combo. I have been diving the X1 as a backup first (with the Harmmerhead and the VR3) but since my VR3 failed again halfway through my trip it became my secondary deco computer quickly. I really look forward to the X-Link which will allow me to monitor 3 cells (1,2,4) and get deco information based on actual PPO2 throughout the dive. One might think that my opinion is biased by my dislike for the VR3 but don&#8217;t be fooled, the X1 really is the next generation of dive computers and I <strong>highly recommend</strong> it.</p>
<p>In an earlier post, a commenter said the following:</p>
<blockquote><p>Why would anyone give a fuck about the interface</p></blockquote>
<p>My response:</p>
<blockquote><p>Because if I can&#8217;t remember from trip to trip how to do things on [the deco computer], all other aspects of the computer are irrelevant. If it takes forever to configure my bailout gases, calibrate, change any settings, it&#8217;s not a good interface therefore not a good computer, that&#8217;s why ? Is the interface irrelevant in Windows, Mac OS X ? No, it&#8217;s the most important thing for desktop operating systems. Here you have a device which you have to manipulate often, sometimes in very stressful situation (bailout&#8230;), in the water, with dry suit gloves on, in current. The interface has to be stellar, it&#8217;s a key component. Lots of people like to follow the bouncing ball with the VR3 but with the arrival of Shearwater, Nitek X and X1, they no longer _have_ to.</p></blockquote>
<p>Also, and though all of my diving with the X1 was on a rebreather, the computer would perform equally wonderfully as an open circuit deco computer.</p>
<h2>What&#8217;s next ?</h2>
<p>I haven&#8217;t gotten my hands on the X-Link (PO2 module for the X1) yet so look forward to a review together with the new version of V-Planner Live. I would like to get my hands on a <a href="http://www.shearwaterresearch.com/">Shearwater Pursuit</a> (which comes highly recommended and can be configured as a solenoid controller), Dive Rite Nitek X and an OSTC soon as well. I also look forward to trying out the new <a href="http://www.technologyindepth.com/vrx.html">Delta-P VRx</a> which I am hoping corrects many of the user interface issues I found on its older sibling.</p>
<p>Coming soon as well is an article by Soggy on why he doesn&#8217;t dive with a deco computer.</p></div>
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		<title>Feeling Fizzy on the Holmes</title>
		<link>http://www.thinkingdiver.com/decompression-diving-accident/?utm_source=rss&#038;utm_medium=rss&#038;utm_campaign=decompression-diving-accident</link>
		<comments>http://www.thinkingdiver.com/decompression-diving-accident/#comments</comments>
		<pubDate>Tue, 02 Dec 2008 13:35:35 +0000</pubDate>
		<dc:creator>soggy</dc:creator>
				<category><![CDATA[Decompression Diving]]></category>
		<category><![CDATA[Trip Reports]]></category>
		<category><![CDATA[DCS]]></category>
		<category><![CDATA[Decompression]]></category>
		<category><![CDATA[scooter]]></category>
		<category><![CDATA[wreck]]></category>

		<guid isPermaLink="false">http://www.thinkingdiver.com/?p=328</guid>
		<description><![CDATA[The following is a report I wrote after experiencing a minor decompression injury while diving the Alma EA Holmes Wreck off of Boston, MA. January 7, 2007 The Plan Planned Profile: Depth (fsw) Time Runtime Notes 160 30 30 Bottom &#8211; 21/35 120 1 First deep stop 110 1 100 1 90 1 80 1 [...]]]></description>
			<content:encoded><![CDATA[<p>The following is a report I wrote after experiencing a minor decompression injury while diving the Alma EA Holmes Wreck off of Boston, MA.</p>
<hr />
<p>January 7, 2007</p>
<h2>The Plan</h2>
<div style="float: right;  margin: 8px;">
<p style="margin-top: 0px; margin-bottom:0px;">Planned Profile:</p>
<table style="border: 1px none; font-size: 10px; height: 270px;" border="0" width="312" align="left">
<tbody>
<tr>
<th style="font-size: 10px;">Depth (fsw)</th>
<th style="font-size: 10px;">Time</th>
<th style="font-size: 10px;">Runtime</th>
<th style="font-size: 10px;">Notes</th>
</tr>
<tr>
<td>160</td>
<td>30</td>
<td>30</td>
<td>Bottom &#8211; 21/35</td>
</tr>
<tr>
<td>120</td>
<td>1</td>
<td></td>
<td>First deep stop</td>
</tr>
<tr>
<td>110</td>
<td>1</td>
</tr>
<tr>
<td>100</td>
<td>1</td>
</tr>
<tr>
<td>90</td>
<td>1</td>
</tr>
<tr>
<td>80</td>
<td>1</td>
</tr>
<tr>
<td>70</td>
<td>4</td>
<td></td>
<td>Switch to 50%</td>
</tr>
<tr>
<td>60</td>
<td>2</td>
</tr>
<tr>
<td>50</td>
<td>1</td>
</tr>
<tr>
<td>40</td>
<td>2</td>
</tr>
<tr>
<td>30</td>
<td>3</td>
</tr>
<tr>
<td>20</td>
<td>14</td>
<td></td>
<td>Switch to O2</td>
</tr>
</tbody>
</table>
</div>
<p>My dive buddy Scott and I were diving together and our plan was to spend 30 minutes on the bottom at 160 fsw.  We were breathing 21/35 in our double 130s with a rock bottom of 1000 psi.  We were also carrying two aluminum 40s with 50% nitrox and 100% O2 for decompression.  The plan was to descend and, per Heather&#8217;s suggestion, run a reference line across the beam of the ship so we could scooter around either side without losing track of the upline.</p>
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