Unfortunate Man Floats Upwards

CONTROLS

Arrow keys or WASD to move
[tap] space to swim up
while right outside the bubble, click to push it away from you. 
while inside the bubble hold down the mouse button to drag the bubble with you.

INSTRUCTIONS

keep an eye on your o2 meter down on the lower left, if it completely empties its game over.
the bubble will refill your o2.

interact with the buttons and levers to open up a path to the exit.

you're trying to go up then enter the submarine to escape.