Next, swim through the sloping tunnel at floor level on the north wall.

This tunnel bends upward...

...then around to the right...

...dips down and back up....

...and eventually brings you to a room where you can surface and climb out of the water.

This small room has a blue star patterns on the ceiling, many columns, and a chain. Lara can't pull the chain while it's half underwater.

So pick up the revolver ammo in the southwest corner and follow the twisting passageway back up to the COMPASS ROOM...

...where you emerge through the NORTH DOOR.

Go through the EAST DOOR and follow the ramp down to a room with 2 henchmen guarding a lever.

If you run at the one on the left while firing, you can take him out fairly quickly.

Then roll and deal with the one on the right.

Use the lever...

...to lower the water level in the other rooms.

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