>>13667586
Problem is it can go to shit really fast. Open the door? Sub flooded, hope you have tunnel below you otherwise you are dead, otherwise have fun fixing the hull after you smash into the walls. Oh look, reactors flooded, hope the sub maker gave extra fuel rods so you can get it going again, everyone has probably drown at this point anyway though.
another issue we ran into a lot was a shitload of anon on a boat with nothing to do. So they make their own entertainment by pulling out wires, harassing security, drowning each other in the bilges or poking holes in the hull. Can't say I blame them though, communication can be hard and they probably didn't know what was going on.
Another good game mode would be a static installation thats needs to send an away team to retrieve an artifact. Shit can attack the station to keep the guys staying there busy.