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Decompression chambers are for commercial saturation divers, i.e., people who may spend days or weeks at subsurface pressure (even if the chamber itself is located on board the ship/rig). So they need to plan not just for onboard toilets for pooping, but also sleeping cots, meals, etc.
Thankfully, in recreational diving (which requires no decompression) or in technical diving (which requires relatively short in-water decompression, without a chamber), the timeframes are in hours at most, so they normally don’t need to plan on pooping.
As far as peeing is concerned, divers can pee directly in their wetsuit (different people have different opinions on that practice…), or in their dry suit using a special valve. Some divers would rather wear a diaper for peeing in a dry suit because the valve becomes a point of failure. But in either case that’s not for pooping.
I’ve only ever dived (and taught diving) in a non-military context so I wouldn’t know about Navy divers, but I don’t imagine it would be much different.
TL;DR: diapers do get used in longer dry suit dives but that’s really just for peeing 1 reply
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