After using the 2 levers, navigating the underwater passageways, and collecting various goodies, as shown in the previous section, you surface in a small room with spikes on the floor. Walk through the spikes to the opposite corner.
Here you'll find a small medi pack (52) and a switch. This opens the underwater door you just saw and, naturally, it is timed.
To get there, flip the switch, press Look to escape the cut scene of the door opening, roll...
...then walk forward through the spikes to the angled block in the corner.
- OR -
Alternatively, use the switch, press Look, roll, then take a running jump onto the corner block. This is much faster, but Lara will lose a little health to the spikes.
Make sure Lara is squarely facing the wall. Then side flip to the left twice to land on the other ramp then in the water.
Turn left and swim through the door before it closes. Pick up the MAGNUMS (53).
The door reopens automatically. Swim back across the passageway and climb out of the water in the spike room once more.
Walk through the spikes to the red-and-gold block in the near right (northeast) corner.
Face the red-and-gold block and sidestep all the way to the left wall. Press Action + Forward to pull up onto the block without injury. Retrieve some magnum clips (54). Climb onto the higher block to the right (the tan one with the low ceiling above it).
Turn around so Lara is facing the wall with the horizontal crevice. Step to the outer left corner of the block and angle Lara slightly to the left. Then jump forward to grab the edge of the alcove above the horizontal crevice.
Pull up and pick up more magnum clips (55).
Turn around and take a running jump across the room to the opposite ledge.
Turn right, walk out onto the sloping ledge (it's safe) and climb onto the tan block above, where you'll find a small medi pack (56). Drop back down and climb into the raised opening on the left.
NOTE: It's possible to take a running jump back across the spike room to grab the sill of the THIRD GOLD DOOR, but that's not where were headed. We want the smaller raised opening in the southeast corner.
DARK MODE: Even with brightness adjusted, dark images on a light background can be hard to see. May I suggest a reputable dark mode browser extension, such as Dark Reader? (Download only from trusted sites, like darkreader.org or your browser's web store.)
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