cut a hole in the top

almost like the real thing...

You can still exit the sub and enter station airlocks through the side doors.

we don't need to leave where we're going

Should've added no doors at all in my opinion. If you were going for the full immersive experience you wouldn't leave the sub again anyway.

That's true that you can exit the sub and enter the station from one of the sides.

But not having top airlock makes the sub to not connect with the station properly so recharge batteries is impossible due this.

Sub really does an impressive job by simulating the real thing limitations. But it makes the whole mod a "one shot thing", basically you gonna die in 5 minutes no matter what the moment you left the station and thats it, end of the mod, uninstall or keep it or whatever.

It is Impossible to go further in the campaign on this with its actual design, maybe would be cool do to some MARK-II or MARK-III models of this stupid can of coke to fit in the Barotrauma game by making the submersible at the very least a valid but precarious choice to do a campaign run, heck even without turrets is perfectly fine, veteran players would love this hardcore challenge.

please make another version with guns and top hatch to use for whole play through.