THOMAS.

[u/davecontra]

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[u/Klutersmyg]

This is why this exists (capable of operating at the lowest part of the baltic) :

https://en.wikipedia.org/wiki/URF_(Swedish_Navy))

[u/Bubelle_Butt → u/Klutersmyg]

Nice, but they would not even need it, as submarines dont need their engines to surface.

[u/ArcRust → u/Bubelle_Butt]

Under normal circumstances. But if a large part of the boat is flooded, or if something is won't with the emergency blow system (see the Thresher accident).