[DOC] [TLE] Breathing gas - Wikipedia [PAR] A breathing gas is a mixture of gaseous chemical elements and compounds used 
for ... The techniques used to fill diving cylinders with gases other than air are ... 
Trimix is a mixture of oxygen, nitrogen and helium and is often used at depth in .... 
Hydrogen (H2) has been used in deep diving gas mixes but is very explosive... [DOC] [TLE] Hydrox (breathing gas) - Wikipedia [PAR] Hydrox, a gas mixture of hydrogen and oxygen, was used as a breathing gas in 
very deep diving. ... Hydrogen is the lightest gas (half the weight of helium) but 
still has a narcotic potential and ... (1650 to 2300 feet) in depth, while breathing 
gas mixtures based on hydrogen, called hydrox ... Texas A&M University Sea 
Grant. [DOC] [TLE] Underwater diving - Wikipedia [PAR] Underwater diving is the practice of descending below the water's surface to 
conduct ... The term "deep sea diving" refers to underwater diving, usually with 
surface ... than scuba which makes them attractive to covert military divers to 
avoid detection, ..... Mixed breathing gases are routinely used to reduce the 
effects of the... [DOC] [TLE] Rebreather - Wikipedia [PAR] A rebreather is a breathing apparatus that absorbs the carbon dioxide of a user's 
exhaled ... Rebreather technology may be used where breathing gas supply is 
limited, such as ... habitats, and saturation diving systems use a scrubber system 
working on the same ... Exhaled air at sea level still contains roughly 16% oxygen
. [DOC] [TLE] Brief History Of Mixed Gas Diving [PAR] Sheck plunged to a depth of 780 feet within the Mexican cave system known as ... 
He suggested that helium would be a suitable gas for deep diving without 
narcosis. ... potential for deep diving using helium and oxygen as a breathing gas 
mix. ... This work established that animals breathing an 80 % helium / 20% 
oxygen... [DOC] [TLE] 3 Types of SCUBA Diving Gas Mixes - LeisurePro.com [PAR] Oct 26, 2013 ... Here are just 3 of the air mixes for specific types of diving that you can get 
certified to use! ... SCUBA tanks can also contain mixtures of different gases that 
will allow ... tank of air or nitrox to be used for the shallower sections of the dive. ... 
in extreme commercial diving beyond the depths of trimix or heliox. [DOC] [TLE] Raising the Dead | Outside Online [PAR] Aug 1, 2005 ... At the bottom of the biggest underwater cave in the world, diving ... One of them, a 
South African named Nuno Gomes, had claimed a ... breathing deep-dive gas 
mixesusually a combination of helium, .... combining extreme depth with 
demanding work, Shaw and Shirley were just the guys to pull it off. [DOC] [TLE] Custom Mix vs. Standard Mix: Best Mix is a question of balance | SDI ... [PAR] Nov 1, 2010 ... Picking suitable gases for complex dives (whether shallow, deep or in between) 
is ... of that debate, recreational divers do not use argon as a breathing gas. .... At 
extreme depths, narcosis can cause hallucinations and unconsciousness. ... 
Helium is second lightest and second most abundant element in the... [DOC] [TLE] Scuba Diving Glossary - The Scuba Doctor [PAR] Glossary of technical terms, jargon, diver slang and acronyms used in scuba 
diving. ... Atmosphere Absolute (ATA): 1 ata is the atmospheric pressure at sea 
level. ... Deep Diving: For recreational divers a deep dive is one with a maximum 
depth ... in the breathing loop as the diver proceeds to deeper depths and the 
gases in... [DOC] [TLE] Water Physics [PAR] Jan 9, 2008 ... We use terms like "the cruel sea" or "the cold ocean". ... Ironically, although oil 
and water don't mix, crude oil does mix with the skin oils ... with a fringe of 
hydrophobic hairs near the breathing tubes at the posterior end of the body. ... 
Sharks have large, oil-filled livers which help them float; Flipper and other... [DOC] [TLE] Proceedings of the Advanced Scientific Diving ... - Smithsonian [PAR] Feb 23, 2006 ... Cover graph:

Question: This 2nd-lightest gas is used in breathing mixtures for deep-sea divers to help them work at extreme depths
Answer: helium