have to return to the surface and catch your breath before coming back.
Since you probably already have several medkits, leave this one alone and
continue down the tunnel until you can pull the lever. Swim back out and
fill your lungs before swimming back to the tunnel and go through the open
door to find and pull another level which opens a door back out in the main
pool. Refill those lungs once more then dive down and go through the door
you just opened and pull that lever. This opens the door above, behind
which are M-16 clips and two boxes of shells.

Wade into the next room and flip the switch. Keep ahead of the moving
spiked wall and fall through the trapdoor. The current should take you
right to the Gold Key and the gate should open as you near it. You should
end up back in the starting room at the base of the falls. The key you just
obtained fits the lock at the top of the ladder in this room and opens the
underwater gate also in this area.

Once the gate is open, continue down this passage heading right then take
the right branch of the fork. Swim through the grating and head for the
left wall. The lever you seek is behind the second pillar so pull it to
open the exit to this area and clear the path to the Silver Key. A Fighting
Fish should be attacking now (or very soon). Kill him but don't waste too
much air as you can always out-swim him. Continue around the pillar to find
the exit and head that way. When you reach the fork, take the other passage
this time and swim up into the door you just opened and into the cave.
Climb onto the ledge and if you haven't done so already - kill that fish!

This area is infested with spiders so eliminate all you encounter. Some Uzi
clips are near that giant spider web, as are more spiders. When you reach
the large cave there are even more giant spiders to deal with. Kill them
all then start making your way up the ledges until you can do a running
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