spot. Later on there's a Secret nearby.

Backtrack with the Security Pass to the red hallway. Near the door, push the
button to open the portal. The switch on the other side of the grating will
close the door up again: do not go to the trouble of finding that switch.
It's evil. Put the Security Pass in the lock and climb the ladder. The hole
in the side of the large chamber, above the waterline, is the path to the
evil switch. Don't do it. Jump in the water and take the Save Crystal as you
swim down the tunnel. Swim the long tunnel and then backtrack for the
power-ups. In the small room, be mindful not to surface in the path of the
electric beams. Climb up and jump the beams to the ledge. In the cargo area,
climb the boxes on the left. Pistols and the Desert Eagle await you in the
small room.

When you exit the room, sprint through the electric eye and beneath the
ledge as the gun turret unloads. The gun will reset once you're out of
sight. Climb the boxes back to the cargo area. Time for the big Secret
backtrack. Since the door in the yellowish alcove is open, you can make it
back to the floor area of the chamber with the big dish. Go all the way back
to the guard that was looking in the wrong direction. He's armed and
dangerous. Take the Security Pass he drops and open the door at the far end
of the corridor. In the short hallway, pick up the Grenade Launcher.
Backtrack once more, all the way to the cargo room. Head up the wide slope,
ready for armed resistance.

Clear the hallway and take the ladder upstairs. The button on the right is
the one you want in order to move the boxes. The other lets enemies enter
from the nearby gate. Use the box to climb to the upper ledge in the cargo
area. Monkey-swing over to the ledge. Watch that winch when you exit back to
this area, that's when it's a killer. Kill the guard above and take his
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