... it ran out days ago (assuming it didn't implode):
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The 96 hours thing comes from the Oceangate website factsheet. Do you think they ACTUALLY tested that by putting five people in it for 96 hours?
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Whatever went wrong with the sub (electrical failure, implosion) probably compromised the oxygen supply or made it redundant.
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The 96 hours assumes they breathed evenly. Do you think they weren't panicking and trashing and screaming and hyperventilating?
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Oxygen is only one part of the problem, the other is dangerous CO2 buildup. These subs have CO2 removal systems that need replacing every 10 hours or so. They would be inhaling dangerous levels of CO2 long before they ran out of oxygen.
They're mega, mega dead.
The initial loss of contact was due to megadeath, probably
Oceangate owner was like "I have a great playlist for while you're descending"
When asked about some of the music files on his work computer, the intern merely said "I enjoyed some of the harder soundtracks for games I played on the Sega Saturn," but investigators remain wary of him having a folder titled "bit-crushed heavy metal jams".