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Harpoon

Control

Space, Alt - Forward, Back
Ctrl, Shift - Upp, Down
W, S - Upp, Down Correction
A, D - Right, Left
Q, E - Rotation
L - Light
1 - Torpedo
2 - Main Guns
Arrows - Main Guns Rotation

That If you turn UNDERWATER then you had to press the Q/E and A/D keys at the same time because the submarine tends to tilt. To do this if you have to press the keys at the same time they will correct each other and it will turn smoothly (Q+D - Left, E+A - Right)