Take a standing jump with Action to get over the orange trapdoor. (If Lara falls through, she'll slide onto the burner below. You can then jump into the water to put out the flames, but you'll have to swim past the crusher again and climb the ladder once more.)
Beyond the trapdoor, continue forward, into the main room. The door will close behind you. Pull up onto the tall pillar with the pipe-organ decoration.
Drop through the trapdoor you just opened into the pool below.
Climb out of the water in a room with a locked door and several alcoves. Two of these alcoves have breakable grating over them. Shoot out the grating in the alcove nearest the locked door to get some flares. Then use the VAULT KEY in the keyhole to unlock the door.
NOTE: As long as you have the VAULT KEY, you can ignore the second grating-covered alcove. It contains a blade trap and a switch, which you probably won't need to use. It If you missed the VAULT KEY, you'll have to go back for it now. See the footnote at the end of the main walkthrough for instructions.
Enter and pick up a large medi pack in the left corner.
On the other side of the VAULT there is a small opening in the floor. Below is a roughly H-shaped network of underwater passages.
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