There was a similar thought on IANTD - discussing why divers on very deep record attempts should not use air as a dry suit filler.
Oxygen, usually 21% at sealevel effectivly doubles ratio when you go to 10 meters depth ( ie acts as if it was 42% saturation ) - if you go deeper like some mad people do ( say 160 meters or lower ) you actually reach the point where methane will combust.
( at sealevel, with 21% o2, methane needs something like 300 degrees to combust. As you increase pressure, or increase oxygen % this temperature requirement lowers. With the increase in pressure, increase in O2 effectivness, the flash point for methane drops to 30 degrees at around 160 meters underwater ( if using enriched air )
So if a diver on a record attempt farted, the fart would self ignight, and due to the O2 rich environment it would burn out the diver and the dry suit - probably causing instant death.
So ( apart from being a better insulator ) use ARGON as a drysuit gass when setting record attempts.
Swiped off fibnet, never fart in a wetsuit!
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