After solving the statue puzzle, as shown in the previous section, Lara emerges from the flooded cavern into a rough-hewn tunnel. Run forward along this tunnel...
...but slow down after the drop-off. A little way ahead, there's a pounding block trap.
To get past the block, wait for it to descend and run up against it. Continue to hold Forward.
Then, as the block rises, run/sprint underneath it to safety.
Continue along the tunnel to a large (but dry) cavern.
The bats here are decorative. No danger, no kills. At the cave mouth, pull the lever on the right...
...to raise some hexagonal floating platforms. Some of these are unstable, and it's a long way down, so save the game before proceeding.
NOTE: We're all about 100% completion here, but if you like, you can skip the next pickup, in the alcove high on the right wall, and just head for the far side of the cavern. (The archived classic guide includes screenshots for the direct route.)
To get the pickup in the alcove on the right cavern wall, start by backing away from the edge so Lara is standing at the top of the slight slope in the tunnel opening (where there's a seam between the textures). Take a standing jump (no run-up) onto the middle platform in the second row.
When you land here, some of the platforms ahead fall away; others arise.
Activate walk mode. Turn right to face the alcove. Step to the back of the platform then take a short hop (Walk + Jump) to the next platform.
Again, wait for various platforms to sink and rise. Then step back and take another short hop to the next platform, just below the alcove.
When you land there, a new platform appears overhead. Turn left, walk to the edge, and jump straight up to grab it. Pull up.
Turn right and jump into the alcove. Pick up another AQUA-LUNG (3), which you probably won't need.
To get down, turn around to face out over the cavern. Walk to the edge and take a standing jump down to the the solid stone ledge below on the right.
When Lara lands on the stone ledge, three new platforms rise up ahead, but you can ignore them. Instead, step back so Lara can get a decent run-up. Then take a running jump over the low wall where it angles down in a V shape to land in the tunnel opening ahead.
- OR -
Alternatively, if you're having trouble lining up the running jump, instead walk to the far edge of the stone ledge. Take a short hop to the middle of the three hexagonal platforms.
Turn left, and take a standing jump over the third platform directly into the tunnel opening.
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