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Blue Manta

It's a hover submarine. Able to fly and swim.
For collecting artifacts in the HIGH SEAS
Tries to brake while no key is entered.

WSAD - Move
Space - Up + Ctr rises more
Shift - Down
E - Rise (Only in the air)
Q - Fall (Only in the air)

T - Magnet
LMB - Detach the wings
G - On-ground mode
H - Space planet mode
Y - Sailing mode

Reduce buoyancy in space mode and turn off in ground mode.
Sailing mode tries to swim just above the surface of the sea.
I've collected the logic blocks for each mode around the tail so you can change the control keys as needed.