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Rebreather Science...


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#1 shadragon

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Posted 15 October 2007 - 05:01 AM

Watched a 2 hour Discovery Channel special last night called Pacific Abyss. Was about deep divers on rebreathers looking for fish in the 300 - 330 foot depth range. Locations varied from Chuuk Lagoon, Yap and Utila with other less known reefs and atolls in-between.

Buddy had his rebreather electronics flood on a dive at 160' and fill with sea water. Then the next day he goes to 330 feet on the same repaired box. Typical dive profile was 4 - 5 hours.

Interesting show...
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#2 ScubaDadMiami

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Posted 15 October 2007 - 10:16 AM

I, too, would like to know how to perform such service on my unit. If my handsets were to flood, my only option would be to send back for service. Of course, Richard Pyle is one of the most experienced rebreather divers on the planet.
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#3 shadragon

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Posted 15 October 2007 - 10:34 AM

I, too, would like to know how to perform such service on my unit. If my handsets were to flood, my only option would be to send back for service. Of course, Richard Pyle is one of the most experienced rebreather divers on the planet.

No argument. I was just a little shocked they went to 330' the day after pouring two cups of sea water out of the electronics bay. This while power was applied to the unit for an hour and a half while they ascended. I would not fully trust a flashlight that flooded until I had taken it for 2-3 dives. :P
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#4 Basslet

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Posted 15 October 2007 - 10:53 AM

I met Richard Pyle at an all day program at the Explorers Club in NY. I got a special invite from a member of the club. He was totally amazing, as were some of the other presenters. Like a dude who studies decompression illness. It was a special program all about ocean explorers. I'll have to look for a repeat of that Discovery show. It sounds really cool.

Edited by Fairybasslet, 15 October 2007 - 10:54 AM.


#5 Latitude Adjustment

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Posted 15 October 2007 - 02:12 PM

Buddy had his rebreather electronics flood on a dive at 160' and fill with sea water. Then the next day he goes to 330 feet on the same repaired box.


I sometimes wonder if this isn't done for a little drama to sell the networks. Stan Watermans films always had something, the guy who was bit by the seasnake, oh no, did it break the skin? We'll know after this commercial if he's still alive! His daughter swallowing a brissle worm, I think since everyone learned from him they've all adopted that format.
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#6 PerroneFord

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Posted 16 October 2007 - 08:11 PM

I, too, would like to know how to perform such service on my unit. If my handsets were to flood, my only option would be to send back for service. Of course, Richard Pyle is one of the most experienced rebreather divers on the planet.


If you were going to do a dive of this magnitude for national TV, wouldn't you try to carry a spare head?

#7 ScubaDrew

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Posted 16 October 2007 - 08:22 PM

I, too, would like to know how to perform such service on my unit. If my handsets were to flood, my only option would be to send back for service. Of course, Richard Pyle is one of the most experienced rebreather divers on the planet.


If you were going to do a dive of this magnitude for national TV, wouldn't you try to carry a spare head?


Yeah, sw in electronics destroys pretty much everything. I am sure they just fixed the housing problem and replaced all the guts.
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#8 ScubaDadMiami

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Posted 16 October 2007 - 09:16 PM

Actually, they stripped the handset, soaked it in fresh water, cleaned it and then rebuilt it. Richard Pyle answered these questions in a post from several of us that asked about it.

Some day, I would like to be able to afford a spare head.
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#9 Scubatooth

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Posted 16 October 2007 - 09:18 PM

hmm never mind wrong rebreather... i was thinking of the prism

Edited by Scubatooth, 16 October 2007 - 09:19 PM.

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#10 shadragon

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Posted 18 October 2007 - 11:38 AM

I sometimes wonder if this isn't done for a little drama to sell the networks. Stan Watermans films always had something, the guy who was bit by the seasnake, oh no, did it break the skin? We'll know after this commercial if he's still alive! His daughter swallowing a brissle worm, I think since everyone learned from him they've all adopted that format.

Perhaps. I actually saw it again last night and you could see bubbles coming out of his rebreather during the ascent so I doubt it was staged. Who knows...

I did note they were having issues with a "CIS Lunar" if that means anything to you...
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#11 Scubatooth

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Posted 18 October 2007 - 11:49 AM

Shadragon

some bubbles coming out of a rebreather on ascent is normal (small) due to over pressurization valves on the circuit opening so as not to over inflate the divers lungs. now a large number of bubbles is a bad problem.

SDM care to add anything?

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#12 shadragon

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Posted 18 October 2007 - 11:53 AM

some bubbles coming out of a rebreather on ascent is normal (small) due to over pressurization valves on the circuit opening so as not to over inflate the divers lungs. now a large number of bubbles is a bad problem.

They commented on the bubble volume over the underwater comms. Again, might be for drama.

Feel free to watch it yourself and let us know:

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#13 Scubatooth

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Posted 18 October 2007 - 12:00 PM

I watched it but i dont remember the bubbles thing, I will watch it again on sunday.

probably for dramatic show.

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#14 ScubaDadMiami

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Posted 18 October 2007 - 12:03 PM

I don't recall them mentioning any issues with bubbling. I am guessing it was just the normal gas venting that goes along with ascending that Tooth mentioned.

One of the things that comes along with switching over to a rebreather is that a lot of divers have to learn how to keep from accidentally venting precious gas out of their noses and masks. It is not a big deal on open circuit systems, where you usually have enough gas that a few bubbles lost here and there don't matter much. However, in a rebreather, which typically has a very limited gas supply (such as 13 cubic foot tanks), any such leaking counts a lot more. So, divers have to make sure not to accidentally let out any of this gas from the breathing loop when not intended. It is not as easy to do as you might think.
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#15 Basslet

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Posted 22 October 2007 - 08:59 AM

Finally got to see it. It was a great show. When I saw Richard Pyle speak at the Explorers Club, he was talking about how he always tears his rebreathers apart and rebuilds them. Frankly, I would trust him to fix mine before I would trust my LDS. LOL

I thought the deep divers were so funny. Typical science nerds when they found a new fish. It was a great show. Thanks for the heads up.

Then I saw that the "hosts" of the show do other "abyss" shows. There was one about the Amazon but I missed it.




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