First Steps
Jump into the water. Dive into the passage and up the next shaft. Climb out of the water on the right. There is a killer up in the window. He might come down for you. Kill him and then take care of the dog coming from the right. Then shoot the guy coming through the gate and a brawler coming down the stairs. Collect some shotgun shells the killers have lost. Then run into the little chamber right of the waterhole and collect a large medipack. Get back outside.Flamethrowers and Switch
Step into the chamber with the pool. The door closes behind you. Swim through the pool to reach some flares on the other side. Shoot the dog, which appears in the chamber. Then climb the stairs. In the second window, you can collect some shotgun shells. When you approach them, you can see two guys with flamethrowers appear underneath. Try killing them before they get up the stairs. When they set you on fire jump into the pool. One of the guys loses a small medipack. After killing them, use the switch on the upper level, above the pool, to open a door somewhere. Take a running jump over to the passage opposite the switch. Grab the ledge and pull up the passage. You are now on top of the stairs.Open Door and Goodies
Follow the passage and at the end turn left. At the end on your right is the door you just opened with the first switch.Goodies:
Instead of stepping through get into the passage on the left and use the switch on the right wall. Run back and along the passage and turn right. The second door on the left is open as well. Step inside and collect the M16 Clips. Pull out the crate opposite the entrance. Pull it out through the doorway and along the passage. Stop when you have reached the passage with the stairs on your right. Run down and climb up to the right. Run to the right. You are now behind the crate. Step into the chamber again and pick up the M16 Clips, which lay underneath the crate.
Secret 1 (gold coins):
Then pull the other crate aside to find a pile of gold coins underneath. Then step back outside.
Guarded Switch
Climb over the wall and get out to the left. On your left is a ramp. Turn into the broad passage on the right. Behind the window on the left, you can see two guys guarding a switch. Run to the end of the passage and turn left. Turn left again. On your right is a closed door. Climb over the wall ahead and kill the guy with the club and the killer. The brawler loses a small medipack and the killer some shotgun ammo. Step into the chamber on the left. Use the switch to open the other door you came past.Open Area
Get back into the passage and climb over the tiny wall again. Step through the door. You will come into an area with huts. On the right is a door where you will need a key. Turn left. On the right is a box with shotgun shells. Collect them. This will alert the two killers on the roofs above. Shoot both of them from below.Goodies:
Run between the two buildings on the left. Quickly climb onto the box with the M16 clips and from there take out the dog. Then collect the ammo as well as the flares further into that passage.
On the Roofs - Circuit Board
Another killer will appear in the chamber. Shoot him and collect the small medipack. Enter the passage and use the switch at the end. The door opens. Step into the chamber and kill the dog. Then pick up the Circuit Board. Now run over to the other side. You can use the circuit board in the chamber ahead. The door right of it opens. Step inside and light a flare. Jump onto the nearest box on the left and from up there shoot the guy on his snowmobile. Up here, he cannot run over you. Take him out quickly as he is shooting at you. I recommend Uzis. Now before getting down to the ground, shoot a couple of rats. Then climb onto the crate right of the entrance to get some flares. You will need them in here. Now run over to the left to find some M16 Ammo. Run over to the wall at the back. In the left corner you will find a large medipack and a CardKey 1 Type 1. The door at the beginning of the open area is shown to you. A guy with club is guarding it now. Run over to the area right of where you are now. Behind the ramp, you can find some Uzi clips. But careful the brawler might attack. He loses a small medipack.This next part will only get you some goodies, the Grenade Launcher and the Automatic Pistols. If you don't want them, skip the next two paragraphs and continue at Key Card Doors.
Snowmobiles
Get towards the snowmobile the guy has left you. If you need light just fire the canons using the action button. Take the snowmobile outside. If you didn't meet the brawler with small medipack by the ammo, you might meet him on your way out. Another guy with snowmobile leaves his hideout, actually there are two but the second appears later. Drive over to the right. Turn right through the narrow doorway. There you can get to the lower level by driving down to the right. You might find some M16 Clips down in the archway there. Kill the dog you will meet somewhere around, as well as the next guy with his snowmobile. Instead of shooting the snowmobilers from your snowmobile, you can also climb onto any higher block and take them out from there. Although I found the snowmobile chase easier and it's much more fun. Now drive back onto the big ramp inside the building and drive down to the right. If you drive up to the left, you will come back to the roofs and further along you will find the chamber where you found the Guarded Switch. Drive up the ramp and on top of the metal walkway park your snowmobile. At the end of the narrow passage, you can find a movable crate, which leads into the dark room above. Instead of driving up the ramps, you can also get through there.Underwater Fan
Climb onto the wall. In front of you, below, are a pool and a grey/brown platform. Opposite are a couple of windows in a wall that is climbable. A killer is behind them. He will start shooting at you. Take him out with the M16. Drop down onto the platform below. Follow the dark passage. There you will find some flares. Run back outside. Jump at the ladder. Climb up and to the right to get into the window. Pull out the movable crate on the left. Underneath you can find some grenades. In the same chamber on the opposite wall is a now open door. Step inside the passage to find more grenades. Now the door behind the crate is open. Step inside the passage and find the Grenade Launcher. Step back into the window. Below is now one of those flamethrower guys in yellow suit. Kill him from up here. He loses a small medipack. Then jump into the water there you can find an underwater lever. On one side is a tunnel with a moving fan. Use the lever to turn it off. Then dive into the passage. Light a flare. Dive into the dark tunnel on the right. Turn right again and at the end turn left. Here you can get out of the water. Collect the two packs of Automatic Ammo on the ground. Turn around and climb into the dark passage there. In the chamber, you will find a rat and the Automatic Pistols or Ammo. Now swim over to the other side. The door opens. Climb out and drop back onto the ramp. Up to the left, you can collect your snowmobile and/or get into the dark chamber again.Key Card Doors
Drive/run towards the door at the beginning of the Open Area and open it with your key card. Inside you will find a second CardKey 1. Kill the brawler. Pick up his small medipack. Climb into the next chamber. There is a closed door. On the left is a lock where you will need a CardKey 2. Use the switch on the right. Climb back into the first chamber and shoot the killer that appeared. He has the CardKey 2 we need.Secret 2:
Before we continue through the door, we will get Secret 2. Run back outside. Turn left. Turn left again and run into the passage ahead. On the right is now an open door. Run along the passage. You will come to a chamber where you can climb up to the right and on the left is a giant fan. Climb up. Use the switch on the right to open the door at the top. Three dogs will come out. Shoot them. Run up and out through the door. Collect the gold bars. If you look down into the yard, you can see on the roof of which building you are. The waterhole underneath is where you entered. Run back into the chamber with the key cards.