Dunker Oil Drilling Submarine
My attempt at probably the most technically challenging vehicle in the game. A submarine that's also an Oil Rig kinda like in the movie the Abyss, but of my own design...
I had trouble with this in the beginning but after adding >600 pumps it works at ~280 meters, probably a little deeper, but I haven't checked beyond that point. Still needs some work as I need to hook up the compressor into the holding tanks, and there is never ending tweaks to be done.