How do I open underwater door #2?

Hint 1 of 7:

Look for a switch in the flooded room.

Hint 2 of 7:

It raises the water level.

Hint 3 of 7:

Raise the water, swim up, and jump onto the shore.

Hint 4 of 7:

There is a room around here with 2 buttons.

Hint 5 of 7:

To find the room, you may have to blow open a wall.