This sequence is indicated by the solid purple line on the diagram in the main walkthrough.
The swim to the next room is a long one, so you'll probably want to stop off for air in the cave where you started. Position Lara facing south at the opening (switch behind her). Jump in.
Swim down to the snake tile. Here you'll have a choice to go left (east) or right (west). Either one is okay, but I'll only describe one route. Turn left.
Swim down a slope to a T-intersection. Here you can go left (north) up a slope or right (south) down a slope. Turn left.
At the next intersection you can go left (west) or up. Go left.
At the next intersection you can go up or forward (west). Go up.
At the top of the shaft, continue to follow the tunnel as it turns north.
At the next intersection you can continue forward (north), turn right (east), or go up. Swim up...
...to surface in the cave where you started.
Take some deep breaths and dive back down (still be facing north).
At the three-way intersection at the bottom you have a choice to go forward (north), right (east), or turn around and head south. Go forward.
The tunnel slopes upward then continues straight up a vertical shaft.
At the top on the left...
...there's a dead-end alcove on the left (west) containing a small medipack. Grab it...
...and continue east toward a tile with reed symbols on it. Then head upward...
...to surface in ROOM #4.
Pull the switch to open the trapdoor to the last room (#5 in the diagram).
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