This page of the guide has a walkthrough for the first part of chapter 18 of Uncharted 2: Among Thieves called Heart of Ice. The initial part of this chapter focuses on exploration of the ice ruins. You will also have to solve environmental puzzles by manipulating cylinders and gears.
This is another platforming-oriented stage - you won't come across any enemeis. But remember that, despite the lack of opponents, it won't be easy to reach the end. To find the right path, you will have to jump and think a lot.
In addition, you will come across six treasures, some of which were very carefully hidden. You will spend some time on looking for them.
Difficulty level: medium
Number of opponents: insignificant
Chapter type: dexterity-based
You start the chapter by standing in front of the entrance to the temple. Follow Tenzin until you reach another open space.
After watching the cut-scene, turn left and go to the switch. As soon as you do this, your companion will do the same. The passage is open. Walk on the partially destroyed stairs to the rock handles.
Go up and jump towards the bar - it turns out to be a lever. A part of the bas-reliefs will move. Remember that the protruding elements will hide after a few seconds, so be quick.
Grab the cornice at top of the bas-reliefs. When the last element retracts, move to the right. Then go to the rock handle and then jump towards the poles. When you are hanging on the last, get closer to the wall and climb down.
Follow the path to the next staircase.
You reach a fork. Go down the stairs. At their end, you will find a lever - pull it and wait until your partner does the same.
This will start the cylinders located on the top. Now, follow the stairs you have ignored earlier and jump to the first cylinder. Jump towards the second and then the third [secret 1]. Remember, that the second and third cylinders will have wooden ornaments around them - if you touch them, Nathan will fall.
Jump from the third cylinder towards the nearest "balcony".
You will reach a "tower" with several gears. Your task is to get to the bottom. First, jump to the wall in the central part of the room, the one with many snow-covered stones. Climb towards the yellow part and then move towards the first gear.
Grab it to move to the other side. You are back on the ground - move on the protruding element and then jump towards the pole. Swing on it to jump towards another gear. It will take you on the platform. Go to the right and jump over the hole. The problem here is that you have to go through a fast spinning wheel. To go to the other side, you need to go through the gap. This isn't easy to do. Touching the wheel always results in death.
When you get to the other side, grab the wheel that will take you to the wall with protruding bricks - grab them. Move to the right and jump to the destroyed constructions. Standing on one of them, go down and jump to the one below.
Do this again to land on a snow-covered beam (you will notice Tenzin). Turn right (when looking towards the room) and jump towards the pole. Swing and jump on another gear.
You now need to grab the rope [secret 2]. Swing and jump to the snow-covered shelf. It will crumble - Nathan lands on the gear below.