Hi everyone. Here's my sub for the challenge. It has a top speed of 6mph and a max diving depth of -170 feet. Age 1 starts the engine. Age 2 arms the guns. Age 3 opens the hatch. Age 4 lowers the magnet on the bottom. Age 5 and 6 turns on all the lights. Age 7 detaches the marker(only detach the marker when at top speed other wise it falls on top of you). It has 3 rooms, a engine room, a main room with a bed and the ladder and the control room. It can carry a crew of 2 and is meant for scounting misions. Its range is unlimited and the engine (its my own build) works under water. The sub is fictional I just made it up and started building it. Also the cockpit is invisible and is impossible to grab so when you start the game you can see it, sorry about that. Its also VR compatible(I think, I don't have a headset).O and one other thing it works best with the ocean mod on becuase then you can see inside the rooms. I hope you enjoy and please upvote.