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Duck asked While Scuba Diving, is it possible to switch to a different type of breathing gas whilst under water.?
For example, if you go down with oxygen but your tank breaks, can you switch to a tank that contains Trimix? I'm not planning on doing it, but hypothetically, is it possible to switch do a different gas under the water or will there be complications?
And got the following answer:
Yes it's possible. For dives outside the 'recreational' envelope (>40 m, and/or beyond the 'no-stop' time limits and/or in overhead environments), use of multiple cylinders/gases, and hence gas-switching between them, is almost invariably an integral part of the dive-plan. As such, much of the practical dive-skills training needed for 'technical' diving actually focuses on gas-switching, and emergency gas-management drills. However, gas-switches should (ideally!) be planned ahead, and executed carefully. Someone diving with multiple gas-mixes will have constructed a detailed dive-plan prior to the dive to determine when and where they should switch between those gas mixes for optimal safety/minimal decompression (this is the major theoretical component of tech-diving courses). This dive-plan will also include contingency planning to determine what to do if one (or more) mixes becomes unavailable during the dive (e.g. as a result of catastrophic equipment failure). The primary danger involved in gas-switching is that one cannot safely switch to a mix which delivers a pO2 >1.6 ATA at that depth, since doing so has a very high risk of inducing central nervous system (CNS) toxicity, with the accompanying epileptic-like seizures. Secondly, if gas-switches are made in a haphazard fashion (e.g. not at the planned switch depth), this will throw off calculations of decompression obligations, which could result in decompression sickness ('the bends') -- although this is certainly preferable to drowning, in an emergency. The scenario you describe is certainly possible, but very unlikely to be necessary -- no-one uses pure oxygen as a bottom gas, since it becomes poisonous deeper than about 6 m depth. If you were diving with trimix and oxygen, it would be because you were planning a deep (>40 m) decompression dive (for which air would not be an ideal bottom gas), and you would probably also be carrying a rich nitrox (>50% O2) as well. You would start the dive on trimix, switch to your rich nitrox during your ascent, and then to your oxygen for the last (long, shallow) phase of your decompression. If your oxygen cylinder failed, you would be better off switching back to your rich nitrox, rather than your trimix, to minimise the additional decompression you would then have to do. If you meant 'Could I switch from AIR to trimix?' then the answer is yes. Trimix divers using 'hypoxic' trimixes (<21% O2) for deep dives (>60 m, and certainly >80 m) cannot start their dive on trimix, since it might not sustain consciousness. So they will use a 'travel mix' -- usually a 'sport' nitrox (21-40% O2) -- for the initial part of their descent until they reach a depth where their trimix becomes breathable. 21% O2 is the same as in 'normal' air.