Research Base - From the Weather Station to the Prison Block (Part 1)

After the cutscene, Lara is standing inside the dome, looking out over the gulag. Jump down onto the metal ledge, then the ledge below that one. Follow it to the end.

If you like, you can shoot the soldier standing in front of the building below. (This makes things easier when you reach that area, but you won't be able to steal his stuff if he falls over the edge.)

Then step onto the wooden ramp...

...and slide down the zip line. When Lara reaches the end of the line, she automatically lets go and grabs onto the gondola car. You may need to press Interact to keep her from losing her grip.

Climb then jump to the left to grab the horizontal girder. Continue climbing to the left until you can drop onto the deck near where the soldier was standing.

Go down the stairs and jump across the gap onto the wooden platform built onto the side of the mountain. Pick up some arrows if you need them.

Now grapple-swing across the next wide gap. Lara grabs a horizontal branch, swings forward into the next building, and then crashes through the floor into the room below.

Jump from the wooden ramp to grab the white, painted beam with the orange flag. The beam gives way...

...and Lara swings down, jumps forward...

...and grabs a pipe, which then swings around depositing her on a metal girder.

Walk toward the yellow ladder but don't expect to get too far. The girder collapses and Lara drops into an water tank.

Climb out of the water on the wooden pallet and scramble up onto the ledge above.