Shown in video at 4:24- During chapter 2 you will get to an area were you have to raise the water level to proceed. In that area you will find a metal beam in a small room on the top left corner. You will have to swing that medal beam from left to right a few times to gain momentum, and then start making loops.
It helps if you start at the top of the room and also use a downward motion to gain extra momentum. You will need 4 consecutive loops.