
After using the high switch to flood the BURNER ROOM, as shown in the previous section, follow the rusty passageway, just like you did at the beginning of the level.

The part of the passageway where you killed the bad guys earlier is now flooded. Hop in the water and swim down and to the right...

...then left at the T-intersection with the barrels.

As you enter the BURNER ROOM, make a U-turn to the right.

Now that it's underwater, you can reach the lever. (It's on the wall above and to the left of the entrance when facing it.) Pull it...

...to open the door on the opposite side of the room.

Then, if you need air, head for the opening in the ceiling of the little room above the switch you used earlier to turn off the burners.
Fill Lara's lungs then swim back into the BURNER ROOM and straight across, through the door door you just opened...

...then down through an opening in the floor into an UNDERWATER CAVE. There's a scuba diver (6) lurking here, so swim forward into the cave to put a little distance between him and Lara.

Draw the harpoon gun as you roll to face him.

Then let him have it.

At this point, you probably need air, so head for the opening in the cavern ceiling next to the hole where you came in. (It's on the left as you enter and on the right if you swim into the cave and then turn around.)

When you're ready to move on, swim past the hunk of rusted metal on the floor of the cave and into the wide opening in the rocks ahead.

Turn left...

...and swim forward, hugging the left wall...

...to avoid the giant eel that darts out of the alcove on the right. (Like the smaller eels, this one can't be killed, so we treat it as a hazard.)

Pull the lever...

...to open a trapdoor in the ceiling just outside this cave.

Roll, swim out along the right wall to avoid the eel...

....

Just outside the eel cave, head for the ceiling and re-enter the ship through the trapdoor you just opened.
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