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Design of a young Europa engineer, who only was on a submarine couple of times. She had little idea what she was doing, but it turned out not that bad.
Main quirk of this one is huge windows that allow to see what happens outside, and system to block them in case of breakage. Small and long design allows to also know everything that happens inside, so it would be hard to miss an intruder. Flooding will be a problem, but a solvable one.

Dual gun logic was shamesly stollen from Cyclops of ignis (insert link here)
(wip; i've been working on this one for three days, and boring real life wants to be lived, so it's not polished. Comment problems that you find, i'll fix them :) )