Thanks to the rebreather, you will reach one of the internal yards. In the water, there is a large statue standing. On three sides, it is supported by the scaffolding that makes it impossible to topple it, which in turn makes it impossible for Lara to get outside. On one of the sides of the scaffolding, there is a barrel with an explosive liquid inside. You can fire at it and the container will tilt a little. Lara needs to find a way to destroy the scaffolding on the remaining sides.
By the yard entrance, turn right and you will reach the spot shown in the below screenshot. Shoot at the lid of the ramp and pull the string. Thanks to this, down the ramp, a barrel wound in corpe rolls down.
The barrel stops at the edge of the pool. While next to the barrel, shoot at one of the arms of the balance beam.
Lara will tie up the balance beam with the barrel. Now, shoot at the other arm, which gives the balance beam a swing and pulls the barrel into the water.
Release the second barrel from the ramp and tie it up to the other arm of the balance beam, thanks to which you will level the beam and raise the first barrel a bit above the water level.
walk over to the other side of the pool and cut the rope that the barrel is suspended on. Roll the barrel down into the water, at the other side of the causeway. The barrel will float to the other part of the scaffolding. Shoot at the barrel and the statue will lean even more.
At the other side of the yard, there is another balance beam. Stand in the spot shown in the above screenshot and fire an arrow towards the lid. A barrel will come down and it will stop by the blockade.
Shoot at the barrel, which destroys the blockade and makes a way.
Get over to the other side of the pool and shoot at the lid again. Another barrel will come falling down and it starts following the water current.
Quickly, follow the water current for several steps and stand next to the pole wound in rope. AS soon as the barrel floats by the pole, shoot an arrow towards the barrel and Lara will tie it to the pole.
The barrel will get pulled to the left and does not explode in fire. As soon as it stabilizes, cut the rope and the barrel will follow the current.
Now, fire at the barrel. The statue will collapse and make a way for you.