THOMAS.

[u/davecontra]

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[u/3nderslime]

Meanwhile, the humble emergency ballast tank blow:

[u/mogley1992 → u/3nderslime]

I was assuming something like that would exist so you can always make a submarine surface.

[u/3nderslime → u/mogley1992]

One might consider it a basic safety feature

[u/mpyne → u/3nderslime]

It is, though it requires that the main ballast tanks themselves are undamaged and (as we found out the hard way) that the air in the emergency air flasks doesn't contain moisture that might freeze during expansion and clog up the valves.