Again, it's up to you whether or not to take the UPV for this next section.
Once more, swim or drive down from the air pocket into the big room.
Swim directly across the room and into the red tunnel. Follow the tunnel around to the left.
Go through the door you opened with the second lever...
... and around to the left, picking up a save/power-up crystal on the way.
You'll find the third lever in a little alcove on the left wall.
Pull it to open a trapdoor in the blue tunnel. This also lets in 2 more scuba divers. Here, I recommend rushing back to the air pocket for a breath then using your handheld harpoon gun to kill them.
To get back to the air pocket, swim around the open door into the red tunnel...
...and past the first scuba diver.
Turn right into the big room and swim straight across to the opposite opening As you approach, the second diver swims in from the blue tunnel, on your left. You're probably about to run out of air, so avoid him for now and head up to the air pocket.
Take a breath.
Then swim down and harpoon the divers as they approach.
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