Research Base - Fighting Your Way Out of the Gulag

When you're ready to engage the enemy, enter the building near the Soviet Facility Base Camp and loot the supply box and salvage crate just inside. Move farther in and top up your oil flask using the yellow oil can. Then squeeze through the partially open door.

Run forward and take cover behind the green, metal thingy as Trinity soldiers break down the door ahead.

Use your shotgun to kill the first 2 soldiers, who rush in one at a time. Replenish your shotgun ammo here and loot the bodies.

Shoot out the spotlight in the next room to make things a little easier.

As you pass through the doorway, someone throws a grenade down the stairs at Lara. Take cover behind the box in the middle of the room and grab some more shotgun ammo. Then crack open the salvage crate in the corner and continue up the stairs.

Turn left and sprint down the hallway as a Trinity helicopter opens fire, chasing you along.

The gunfire causes an explosion, temporarily stunning Lara and blocking the passage behind you so you can't retreat.

When you gather your wits, continue running. In the next room, veer to the left and take cover behind another green, metal barrier, where there's a box of rifle ammo.

Two men approach from the hallway ahead. You may be able to kill them both by shooting the red fuel barrel in the doorway.

If necessary, finish off any survivors. Advance a little farther.

Then shoot another soldier who comes charging toward you from the next room. Search the bodies and pick up hardwood and herbs...

...plus more rifle ammo and a box of random supplies in the next hallway. Continue around the corner to trigger a short cutscene:

A couple of Trinity soldiers in ski masks toss smoke bombs and grenades at Lara. She manages to escape when a grenade destroys the floor where she's standing, and she falls into a pool below.