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NF Submarine

This was the sub I used in campaign mode when I was cruising around. It CAN carry large pieces but I'd recommend almost anything else over this for salvage.

Controls:

Space/LCtrl: Forwards/Backwards
Q/E: Buoyancy control
W/S: dive down/up
A/D: left/right roll
LShift: magnet on/off

I had a lot of fun driving this, imo it's super intuitive once you understand the movement. It's great for breaching water, and it kind of dolphin swims on the surface if you just give it. You can copy/paste the middle cells to make it as long as you want (just reverse the hinges in some areas to avoid making a circle)