This sequence is also shown in a short video walkthrough.

Swim down into the left opening for SECRET #5—Desert Eagle clips. (If you don't hear the chime, just check the stopwatch in your inventory. The secret should have registered.)

Then go into the right opening.

Pick up the small medi pack in the corner. Roll and pull the lever on the opposite wall to open a concealed trapdoor on the other side of the pool.

Swim out of the lever room and take a breath if necessary. Just don't let the guard see you.

Then swim along the bottom back toward the guard and frogman...

...then around to the right past the tunnel where you came in. (The door inside the tunnel is now closed, so you can't return to the previous area.)

Follow the straight channel with the metal sides to the end.

Surface and climb out on the ledge to the right.

Pull up onto the walkway above. Then crawl forward and around to the right...

...so the guard doesn't see Lara.

Crawl backwards to the hole in the floor and drop into the water below. (This is the trapdoor you just opened with the lever.)

Roll, swim through the save/power-up crystal, and climb out of the water.

Crawl across the metal ledge and around to the left...

...behind the tall, white rocks, where it's safe to stand.

NOTE: It may be possible to save here behind the white rocks, reload, and still get the secret. Just be sure to use a new slot rather than overwriting your previous save, in case it doesn't work and you need to reload. Do not save in the hole with the crystal or in the dark passageway with the guard (coming up). If you reload these saves, you may encounter the invisible wall blocking the entrance to the secret.

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