The Witness: Bunker Laser Puzzles Walkthrough

First things first, use the switch to open up the room. Solving the simple puzzle to the right of the switch will collapse the walls, making it possible to solve the puzzle nearest the switch. Then, close the room up again by moving the switch back to its original position. Now, the next puzzle can be solved. For the solutions to them, see below.

Now, to get to the final part of the puzzle head down to the corridor to the left and down the stairs at the end. Go inside the dodgy looking red room and jump on the elevator at the far side.