After shifting the movable blocks and following the tunnel to this pool, as described in the previous section, you'll notice a panther on patrol on the other side of the water. Ignore it for now.
Instead walk up the short ramp to the right. Jump across to the little island with the pedestal and key. Another panther (14 or 9)* appears from behind the pedestal. So immediately backflip to the ramp where you started...
...and kill the cat from there. (Or, jump up onto the pedestal, which is also safe.)
Kill the first panther (15 or 10)* on the south ledge from the safety of the island. Then take the GOLD KEY (25) from the pedestal.
When you do, the camera zooms out to show a cat statue on a high ledge, which is now illuminated. We'll climb up there shortly. First, let's go after the MAGNUMS.
Completing this area without killing any crocodiles is challenging, but you'll need to do it if you want the "Crocodile Rock" achievement/trophy. Start by moving to the southwest corner of the island with the pedestal. Look to the west, beyond the tan rock formation with the square column extending up to the ceiling, and the carved block on the bottom of the pool, to spot an underwater opening. (If you like, you can scout ahead using Photo Mode.)
NOTE: If you'd prefer to kill the crocodiles as you go, see the second footnote following the main walkthrough for tips.
Dive into the pool and enter that tunnel. As you go, a crocodile (16 or 10)* spawns in the cavern behind you and starts to follow Lara, so don't linger. Follow the tunnel forward...
...staying close to the left wall. When you come to a dark stone block directly ahead, turn right.
Continue along a wider passageway that slopes upward slightly. Turn right again at the next corner.
Continue straight ahead...
...into a room with a greenish stone structure. Surface in the far right corner.
Climb out of the water. Quickly run around the corner to the right...
...and pick up the small medi pack (26) as 4 crocodiles (17-20 or 10)* emerge from the floor-level openings.
As soon as you have the health pack, roll and take a running jump onto the green stone ledge.
Pick up the MAGNUMS and some ammo (27-28).
Take a running jump from the ledge, over the crocs, into the water on either side of the pointed stone structure. The crocs on land will not follow, but you'll still need to watch out for that first crocodile (16 or 10)* in the water.
Swim back through the tunnels the way you came. First forward...
...then left...
...past the metal grating and left again...
...then on into the cavern with the wooden bridges.
Swim on past the carved block and climb out of the water on the island where you found the key.
*NOTE: The running kill counts track the total with or without crocodiles. You'll need to avoid harming any crocs for the "Crocodile Rock" achievement/trophy.
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