Clutch the edge and after that release it (Ctrl). Lara will start falling down, but she will clutch the edge under her with one hand. Press (E) to prevent Lara from falling. After a moment release the edge. Lara will hang just under the ceiling of a large room.
Now release the last edge and immediately fire the hook with line in the direction of the metal roundel. Then move down on the floor. Before jumping down, swing the line a little to guarantee yourself safe landing near the huge door. Lara will be able to use the Thor's Glove in this situation.
Open huge gate by moving it left and go inside the round room with huge statue and tree.
When the animation finishes, move down, behind the rotary bridge. Clutch it and begin moving maximally in the right side. When you reach the end, return to the bridge and walk to the place situated more or less in the middle part of its right arm.
In this location allow Lara to clutch the edge, and after that release it. Shoot the line with hook to clutch the metal roundel. If you do this, Lara will hang on the line. Start swinging the line by walking on the wall left and right. When you reach right side maximally, jump on the narrow ledge. Then grab the bridge's arm and start pushing it as far as possible.
Then catch the metal roundel again and jump on the ledge, which is located near of the bridge's basis. When you get there, walk around rear part of the bridge, clutch it and move it right again to the maximum. When the animation finishes, enter the bridge and pass through opened passage.