Submarine decompression/recompression

[Nic160]

I was wondering if anyone knows how decrompression works on a submarine ? I was under the impression military subs used a single atmosphere system. They keep sea level pressure throughout the sub while diving. I was wondering if this is true and how that system works ?

 

[Xanthro]

Subs keep sea level pressure. It works because the hull keeps the water pressure at bay, and if the hull fails, then the sub can be crushed.

 

[JRRKAR]

As Xanthro stated, the sub is an incompressible cylinder, like a dive tank, and therefore the pressure does not change. That's why they can stay at depth forever or come to the surface rapidly.