Navy Seal Diving Watch

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Luminox Watch Luminox Navy SEAL Dive Watch 3903 - Video

Navy SEAL scuba diving equipment?

I was watching this thing on Navy SEAL training and when they finished diving with regular equipment they used these things called drakkers or draggers or something insted of regular tanks. I'm just wondering what they actuall are. In the show the instuctor said they weren't as safe because they could actually let water in them and if you breathed it in it was like swallowing acid. Also they are kind of square and not as long as a regular scuba tank. Hope that information helps you answer my question(Which by the ways if I wasn't clear was what re they actually called and how are they better or worse?)

Thank you

I think you are talking about a dragger re breather, re breathers preceded open circuit scuba by several years and I believe were used in the second world war, these were oxygen based re breathers and are actually extremely dangerous to use below a depth of about 30ft or six meters oxygen becomes toxic at highish partial pressures 0.6 bar PP is generally the limit set for the use of oxygen as a decompression gas by military and technical divers. modern re breathers are very safe to use with the proper training and experience all diving Equipment is. It is designed for "down stream fail safe" which means if it fails it will fail delivering the breathing gas and "free flowing" all divers are trained to breath from a free flowing gas source. A water leak into a regulator generally is not a serious problem again all divers are trained to "breath past" a small amount of water in the regulator or mouth. should you have a major water leak into a regulator you would simply change to your alternate air source or "octopus rig" or that of one of your dive buddies. with a lot of these "shows" about diving it is quite often said that the breathing gas is oxygen. Oxygen is never used as a breathing gas by divers except in special and exceptional circumstances where it is used as a decompression gas after a very deep dive by military or technical divers. Pure oxygen is never breathed below six meters, a deep dive would be any dive of over 40 meters or about 120ft. an example would be the Lusitania of County Cork in Ireland the wreck lies at a depth of 90msw using special decompression schedules the ascent from this wreck takes about six hours! using open circuit scuba and a last deco stop of two hours at a depth of six meters breathing pure oxygen after a 20 min bottom time. The ascent time would be considerably shorter apparently using semi closed circuit re breathers such as the dragger unit.
Semi closed and closed circuit rebreathers certainly make Deep Diving easier but as to which is best I think it comes down to personal preferance, I cant see the point in using a rebreather for a 20 minute dive at a depth of 20 meters or sixty feet open circuit scuba is fine for this using compressed air as a breathing gas or posibly nitrox if you want to increase yor bottom time a little.

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