Kill the frogman before attempt to get those harpoons.
Then you can proceed down the underwater tunnel until
you can climb out onto a ledge and take the medkit. Slide
down the slope then hang and drop to the floor which
breaks away dropping you even further.

Kill the workman and guard in this next area and claim
their medkits and Uzi clips. Pull out the moveable box in
this area to uncover a few more moveable boxes.
Continue to move the first box until it is in the hallway.
Now you can push and pull the remaining two boxes
until you reveal two concealed passages.

Look for a hole in the ceiling on the other side of the
room. Climb up and kill a patrolling guard up ahead and
the other who sneaks in from the rear. Take Secret #1;
the Stone Dragon from the hole then return to the two
passages.

The left passage goes to a locked bathroom so take the
right passage to the Ballroom and kill the workman and
the guard on your way. Feel free to take their medkit and
flares before entering the Ballroom. Watch out for the
deadly glass as you take out the guard on the second
level. Move around to the side of the hole where there is
no glass then step back and run into the hole letting
your momentum carry you to the ledge below.

You should easily find the Bathroom Key nearby before
making a return jump to the side of the hole without the
glass where you can pull back up to the Ballroom.
Return to the left passage which leads to the bathroom
and use your key on the lock behind the chair. Push the
button to open the double doors and kill the workman
who comes charging out. Go through these doors to find
and push another button to open the door on the
second level of the Ballroom. Go back and press the
other button to shut these doors before leaving.

Back in the Ballroom, drop off and shimmy to the left to
reach the open door. Now you can take the ramp to the
right of the door up to the second level. Take the ammo
from the guard you shot earlier then continue on until
you can do a running jump to grab a ledge which has
Circuit Breaker #1. Take it then return to the door.

You should now be in a hall with several doors. The first
door on the left leads to an empty room but open it
anyway. The only other door you can open (right now)
is the door on the right with the wheel. Spin it to open
the door then enter and drop to the floor. Move the box
until you can reach the switch then use it to open the
door above. Move the box up there so you can reach the
door. Continue through the next room and up the ramp
to deal with another guard, then head for the next room
which has a box in it.

Move this box so you can reach the switch above and
take the Rusty Key that was under the box. You can now
return to the hall and use the key in the door opposite
the open door to the empty room. Enter and drop to the
floor and move the box so you can pull out the box
above. After you pull the first box and push the second
one, you should find a passage to the right. The floor
will break away here and there are also barrels which will
roll over you if you try to simply dart across the
collapsing floor. Instead, run a sweeping arc to collapse
all the panels while avoiding the barrels. You should end
up where you started.

Heavy breathing should tip you off that another bad
guy is lurking in the vicinity. Head around the left corner
and take care of the guard then return to the tiles where
the barrels came from and go get Secret #2; the Jade
Dragon. This is tricky as a lone barrel is waiting to crush
you. Jump up to the sloping passage and as you pull up
you should hear the approaching barrel. Jump back then
to the left to sidestep the barrel then you can proceed up
the passage to claim your statue.

When you arrive at the room with the grate floor and a
boat below you need to drop down to the boat and flip
the underwater switch over by the ladder. This opens a
timed door up above so get back on the boat and pull up
to the floor above and run through the door. Flip the
switch you find in here to permanently keep the door
open, then begin a series of jumps between the two
sloped areas. Keeping jumping until the pit below closes
then you can stand and pull yourself up into the
opening. Flip the switch to open up a section of the wall
back past the area with the boat.

Return to the newly exposed area and kill the workman
and the guard then push the button on the left to open a
timed trapdoor. Run around the pool and dash through
the trapdoor before it shuts. Go get Circuit Breaker #2
which is down to your right. Taking this item opens the
exit which is also on a timer. Grab the medkit then go and
press the button on the wall to drain the water where the
boat is. Trip the exit open again and return back to the
area with the boat. Jump down onto the boat then spin
the wheel to open the door.

The passage leads off to the left where there is a
trapdoor to the Bathroom. The double doors should
form a bridge for you to cross over and get Circuit
Breaker #3. If the doors are open you will need to go
past the trapdoor to find the button which shuts them.
Now with all three Circuit Breakers, drop down into the
Bathroom and kill the guard and workman and take their
ammo and harpoons.

Return to the pool room from the beginning of this level
and get the medkit from the corner of the room. Take a
deep breath and swim through the passage and flip the
switch at the bottom of the tall shaft which will open the
door up top. Now swim up and out through that door
and kill the worker, guard and boss. Use your M-16 to
kill them quickly then take their medkit, shells, and Uzi
clips. Plug in those breakers into their slots then move
the box under the opening above and climb up. Take
care of another workman then flip the switch to flood the
room up ahead. Jump across the overhead ducts to
reach this area.

Follow the passage and kill the Barracuda when you
wade into the water. Grab those harpoons over to your
right then head through the exit to the dark passage on
the left where you can kill another worker. Make a note
of the Cabin Door then continue left to find some ammo.
In the room with the windows you need to spin the
wheel to open the door. Enter and flip the switch then
run to the other side of the room through the timed door
to get some flares. Push the box and use the switch to
open the trapdoor at the end of the hall.

Go to the trapdoor and jump into the ocean. Climb out
and wait for all of those dangerous underwater obstacles
to start swimming towards you. Wait for most of them to
appear below you - which means they aren't guarding
the key - then jump in and begin the race for the key.
The fish are fast swimmers so try not to make and drastic
course changes. Swim through the opening up ahead
and turn right. The windows should now be on your
right and the Cabin Key lies behind the rocks on the left.


Dodge the shark while getting the key then make a
sweeping circle back around toward the opening you
swam through a minute ago. The pack of fish should still
be pursuing so head for the opening. As you exit
through the opening look for a cave opening across
from where you exit. Swim into the cave and stay along
the right wall until you can see a small opening above
you. Swim to the surface and breath and take Secret #3;
the Gold Dragon while you rest for the final race back to
the ship. When you are ready, dive down and exit the
cave and return to the trap door dodging the fish as
needed.

Climb up through the trap door and turn left and return
to the Cabin Door and use that key. Enter and flip the
switch to open a trapdoor outside. Now go push the box
to flip another switch before returning to the cabin
where an opening in the ceiling should be waiting. Climb
up and proceed down the passage until you drop into
the next room. Make your way around to the right to the
hole in the floor. Turn and run into the pool room and
stop before you go in the water. Kill the guard and the
boss and take the M-16 ammo. Dodge the shots of the
frogmen from below and if you need it, go get the M-16
from the dark passage.

Kill the frogmen then jump into the water. If they refuse
to make good targets then jump in and tease them then
climb out and shoot them when they eventually surface.
When both are gone dive in and move the barrel to
reveal the passage which leads to the exit.