The submersible they're escaping from is actually just a supply module rated for extreme pressure, but not life support. It itself is something they escape to when their research sub fails. Pressure on the hull is no problem, but there needs to be a point at which they are forced to bail on it and head for the surface alone. The crux is figuring out a daunting depth to do that from, even if it takes a little MacGuyver-ing.
---------- Post added May 5th, 2015 at 08:24 PM ----------
But does catching air from a submersible pressurised at 1 ATM in something like a Steinke hood help at all even if you're bailing at 15 ATM and making a quick ascent?
---------- Post added May 5th, 2015 at 08:24 PM ----------
If you want a dramatic illustration of what happens.... kill someone. have a character die in an accident. An embolism will make it pretty clear what you don't want to have happen. air at 10 atm is one tenth the volume of what it would be at the surface a liter of air will compressed to 10 atm will expand to 10 liters at the surface. if you fail to vent that from your chest.... well, lets just say drowning will not be your big problem.
But does catching air from a submersible pressurised at 1 ATM in something like a Steinke hood help at all even if you're bailing at 15 ATM and making a quick ascent?