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First. I would look skeptically at someone locking out of a chamber on a sub pressurized at 1 ATM and doing a free ascent. However, with the modern equivalent of a Momson lung, run of the mill US Navy submariners are taught exactly that. I don't know the effective usable depth of a Momson lung, it would take a submariner to know that. I was a surface guy.
Second. I would look skeptically at someone locking out of a submarine in street cloths at 400 feet and swimming to an open chamber. Not because SEALS don't do it all the time, they do. But they aren't wearing street cloths, they have a mask on to see underwater. Besides, at 400 feet, it's damn cold. Real cold. Cold is a real problem.
So, locking out of a pressurized submersible isn't a big deal, but having the correct tools to get to the surface or to a open bell is. Without the correct tools, chances of survival are in the realm of way less then 50/50. With the right tools the chances of survival are very high. Maybe you could give the hero a mask and make him drag the unconscious heroine through the water with a kraken chasing them to lessen the odds somewhat?
Sharks. Need to get sharks in there somewhere.
Second. I would look skeptically at someone locking out of a submarine in street cloths at 400 feet and swimming to an open chamber. Not because SEALS don't do it all the time, they do. But they aren't wearing street cloths, they have a mask on to see underwater. Besides, at 400 feet, it's damn cold. Real cold. Cold is a real problem.
So, locking out of a pressurized submersible isn't a big deal, but having the correct tools to get to the surface or to a open bell is. Without the correct tools, chances of survival are in the realm of way less then 50/50. With the right tools the chances of survival are very high. Maybe you could give the hero a mask and make him drag the unconscious heroine through the water with a kraken chasing them to lessen the odds somewhat?
Sharks. Need to get sharks in there somewhere.