Exit the truck and shoot the guard who arrives on the scene. You can't let him reach the distant alarm (a palmprint activated switch - you'll see several in this level. You'll also see several ceiling mounted gun turrets - Lara will target them, but don't let her shoot!). Climb over the boxes on the left for a small medikit, then head around to the left and go left again under the red rifle sign. The MP5 is in this room, along with two sets of ammo.

Leave the switch alone (it sets off a laser trap) and exit round to the right. Use the nearby button to open the grating and crawl through. Take the large medikit and climb into the next crawlspace. As you enter the next area, crouch to avoid a rolling laser trap and crawl to the left. You have to time it just right, but it's worth another large medikit. Crawl back into the laser tunnel as the trap moves away. When it passes overhead, stand and run to the ledge, climbing up it as fast as possible.

Wait for the guard to pass on your right, and crawl quickly out of the crawlspace. You have to stop the guard before he gets to the alarm pad (which activates lasers across the corridor - these can be crawled under if you're too slow). Use the switch near the cell door at the end of the corridor to open the cell and free a convict. Pick up a small medikit behind the door.

Head for the opposite end of the corridor and crawl through the hole in the wall to avoid the laser-trigger turret up ahead. Pick up flares on the way through. Follow the hallway. Take out the guard in the long hallway and pick up rockets, harpoons and grenades from the small room on the right. Run round the corner to the switch above the obvious trapdoor. Throw the switch and let Lara fall through and slide down a support to the desert floor.

From where Lara lands, turn to the right and go around the pillar. When you step around the pillar, look ahead. A guard will be going for an alarm pad. If he makes it, he seals off a Secret and let's loose some doggies. Once you've collected the grenades in the crawlspace to the left of the alarm pad, get the shotgun shells from the far corner of the area, by the cliffs.

Now drop down to the wire mesh floor and pull the switch in one of the corners. In another corner, a trapdoor drops you to the area below. Kill the guard on duty. As long as the sniper in the upper area was killed before reaching the alarm pad, the small crawl space with the Save Crystal is open. This is Secret #1. After the secret, go into the other crawlspace nearby and collect the Desert Eagle and MP5 ammo from the alcoves. Drop through the trapdoor mesh to the hallway below. Deal with the guard and take his small medikit before investigating the nearby corner.

When you open the small cell with the switch in the hall, the prisoner you let loose takes on the arriving MP. Enter the cell to find the prisoner's half dug escape tunnel. Crawl in and get a large medikit. Back in the long hallway, run over the glass floor and bypass the laser traps in favor of the crawlspace on the left. Pick up the large medikit and the shotgun and continue on. Kill the MP in the next corridor if your prisoner friend is having trouble (it's tricky to avoid shooting the prisoner here, but it doesn't matter too much if you do!).

The buttons on the large panels in the area on the right are monitors for the next trap. When you go for the door in the chamber, bad guys arrive from either side. A switch in one MP's alcove opens the crawl space in the other. If you didn't manage to clear the area before one of the guards set off a laser trap, it can be deactivated using a switch around the corner further down the long corridor.

Crawl through the crawlspace and trip the green alarm beams to alert a guard up the sloping tunnel. Continue up the corridor. When the corridor branches, head to the right. Use the cover of the wall to take down the sniper near the rocket. Drop down to the floor and climb up the ladder on the other side to relieve the dead guard of his code clearance CD. Return to the hallway through which you arrived. This time, take the left turn from the steep corridor to find yourself in a large room with missiles and a conveyor belt. The room also contains a computer console where you use the CD you just found and a couple of laser trips at floor level.

Climb down the ladder to the floor and head into the dark end of the path at this side of the room for a small medikit. The console is in the opposite corner. Hop over the intersecting alarm beams and use the CD. Jump over the alarm beam behind you and go along to the raised walkway. Climb up and shoot out the purple-ish grating in the wall ahead with your pistols (you'll need to jump). Climb in to the duct and head down it for Secret #2 - a Save Crystal. Don't drop down the shaft at the end - there's a ladder and it's a long way down! Return to the moving crane hook, get past it and pick up the shotgun shells. Drop to the ground.

Run and jump to the ladder between the two missiles. Backflip from the top of the climb and turn around. Peg the sniper in the far corner of the upper area and then leap across to where he was (avoiding banging your head!). Take the hangar access key from the corpse. Return to ground level, climb up the ladder out of this area and head back to the rocket room. Drop to the floor and take the hallway opposite.

Step past the hole in the floor. That's launch control and you'll be back soon enough. Continue in the upper hallway and apply the hangar access key to the lock. Kill the guard on the train platform and drop carefully into the area near the electrified rail. Head to the left hand end of the rail and climb the ladder there. Push the button in the control room. A train arrives far down the track when you push the button, so climb back down to track level and head for the carriage. Crawl under the track and climb up a ladder into a small computer room to pick up some shells. From the ledge, stand and jump to the corner of the carriage.

From the end of the train, jump up and grab the edge of the hallway above. Jump up and use the monkey swing above the second set of gratings. You'll have to follow the laser trap for a short distance, then drop to solid ground when the trap approaches. Go to the end of the corridor and drop down at the bottom of the ladder.

Run and jump to the platform and deal with the fleeing figure. Grab the shells from the track bed and then follow the sloping corridor until you get to the UFO hangar. follow the hallway around the UFO. Be careful not to trip any of the green electric eyes, or the gun turrets make you pay. Climb the boxes to the next hall, mindful of another guard up ahead.

He breaks left to right in the large room, going for an alarm down the short hallway. Climb onto the mainframe computer and jump for the upper walkway on the left (as you face the corridor you entered by). Press the button here and drop back to the floor to take out a sniper. Do the same with the button on the right. These buttons actuall control the entrance to the next room - with the snipers out of the way, press the right button, run and climb to the left one, press it and run off the end of the walkway and through the double doors ahead.

In the switch room, take out the guard lurking behind the bank of switches. These switches open the doors to the UFO room itself. The secret pattern is: throw the two on the right end, then throw the switch that's one in from the left hand end. Exit through the small door to the right of the steps and return to the UFO hangar. Back near the UFO, push the button to open a hatch and climb the ladder. Backflip from the top of the ladder to the rafters and pick up the shells. Take a running jump to the walkway above the saucer and drop onto the UFO itself. Pick up the launch code key and slide off the UFO.

Backtrack all the way to the Launch Control room near the rocket silo (down the hole in the floor) - you can jump over the electric rail on your way back and use the ladder to climb down to the launch control room. The launch code card from the top of the UFO goes in a key reader at the end of the long corridor (there's no trick to opening the door on the way!). This makes the launch button accessible. Before you press the launch button, open the door behind you. When you push the button, jump left, roll, and run into a full sprint. Keep running straight while the rocket takes off and don't think too much about where it's going to land!

Leave the control room the way you arrived and go into the empty rocket silo. Using the ladder immediately around to the right, climb high up into the silo. Ath the top of the ladder, move onto the walkway and locate the guard on the opposite side of the silo and on the level above. Kill him by jumping to get a lock with a suitable weapon. With the guard out of the way you can check this walkway out and find the large medikit on a small platform across the silo. It takes some getting to, but can be done!

Climb again and open the nearby corridor. It'll seal behind you. Past the laser trap in the crawlspace (crawl behind it, stand and jump over it, crawl again), pick up the grenades and follow the sloping passage.

Climb out into the open air and plug the sniper on th scaffold. Then take out his mate and head down the slope to the right. Kill a third guard and take his code clearance disc. Flik the switch here and head back outside. Climb the scaffold tower and liberate the dead guard's MP5 clips. Now head down through the trapdoor.

Avoid the laser trap by running after it and ducking under it at then end. B careful as the passage darkens - there's a long drop that you need to climb down, not fall down!. Head up the sloping corridor to the UFO hangar. Go around the saucer and down the ramp to the control room.

Use the code disc in the console to open up both of the nearby doors. Apat from the alien, these rooms yield a Save Crystal, a small medikit, Desert Eagle clips and flares. Return to the main UFO hangar and climb up the ladder again, backflipping onto the walkway as before. Turn around and walk onto the sloping support on the left. Face the opposite side of the hangar (the UFO is to your right and below) and take a running jump to catch hold of the support directly opposite (sloping down towards you). Haul up and look for a platform to your left and little way below.

Take a running jump, with a grab to alter your trajectory, and you'll land inside the doorway to Secret #3. Go down the hallway until you see the double laser trap. When the upper one moves away take a running jump from the ledge to sail over the lower trap. Run to the doorway and drop into the Orca tank to pick up another Save Crystal. Return the way you came, ducking below the lower laser trap as it turns over at the end of the corridor. From the platform, it's a long drop to the floor below, so expect to take some damage.

Climb into the UFO though the open hatch. It's squelchy in here and you need to find a way to climb up a level before wasting the first bad guy. When the middle level is clear you need to climb up again to reach the top level, where there's several consoles and a couple of flashing lights that are dangerous to get too close to...