At the end, you'll reach a platform in the same room. CHECKPOINT. Push the box down.
Jump on the other platform.
Jump on the ledge opposite to it.
Go up, and then lateral jump on the platform.
Continue on the suspended platforms to the green fuse.
The other fuse is down in the pit. I grabbed it faster, by grappling on the ring, letting Lara down easy on the rope (E and down by default) as much as I could and swinging on the other side easily and dropping onto the slide, that's there.
Down in the pit there's a rat. Dodge the rodent, and get onto a box, and then onto the steam pipes. From there grab the platform.
Jump on the rotating thingy.
And jump and grab on the scoops.
Move fast as they drop down, and you'll have to start from the top.
At the last one do a backwards jump onto a ledge. Go around, and onto the pipe.
Go up on the pipe and then on the ledge there (backwards jump).
Go around and do a backwards jump again.
Go up the ledges until you get in the little room.
Run and jump to grab on to the other side, on the tunnel entrance.
Go down the tunnel and back to the control room.