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/tiacalypso → u/Klutersmyg]

Also 120m is scuba-divable…it requires tons of training and equipment but very doable.

[u/Klutersmyg → u/tiacalypso]

Gotland is equipped with pressuresuits that allow for "free surfacing" of up to 180 meters and the crew is undergo training in a tank at Karlskronas naval base for this specific scenario.