Go through the door into the chamber with the little pool. You now have a choice
of routes. The easiest approach is to take the left hand door.
In the chamber that you enter there are some small supply crates containing
some useful items stacked near the elevator doors. You can't call the elevator yet
without an access code which you'll get later in this level.
Head through the door at the end of the chamber on the right and you'll find yourself
in a hallway. You can head down this hallway into a lounge area or go out onto the
sundeck (where there are some more supplies) and approach the lounge across
the slippery ice rink. In the lounge there are a few grunts so be careful.
Having cleared out this room head through the doors at the end of the lounge back into
the chamber with the pool. Take the doors on your left now and you'll find yourself
approaching the helipad.
There are a number of factors to take into account here. The machine-gun nest on
the right is very dangerous but can't shoot through the apache that's sitting on the
helipad. There are also several grunts on patrol, so be careful here. The apache
itself can't attack you when it's on the ground and is being re-fuelled so is not really ready
to take off.
The most important element here is actually the fuel tank which will explode if damaged.
If you or the grunts (with their grenades) trigger this explosion it will take out the apache
and the exploding apache will probably knock-out the machine gun and any of the grunts that aren't
There are more grunts in the bunker on the left of the helipad but they won't come out
to attack until you approach the machine gun nest. The best way to deal with these grunts is to use
the machine gun nest yourself and take them out from the relative security there.
Once all the grunts are dead you can enter the bunker where you can gather some goodies and then
use the radio to get the security code for the elevator door.
You don't need to note down the code - just head for the chamber on the far
side of the room with the pool and then use the button there to call the elevator.
Watch out for the elevator's arrival because a small squad of grunts will arrive in it.
With them out of the way you can press the button inside to head for the next level.