The power switch is located on the half-sunken ship to your right when you start. The boat that covers the entrance is 500 points. When you go up the ship's side, continue straight until you see a stairway to your left leading upstairs. It is worth 750 points to enter. Once inside, go to either the right or left of the cabin and go inside, where you will find a stairway leading up again. Go up and move around the room to find a door that is worth 750 points. Open this, and the power switch will be to your right when you walk in.