After a short cinematic, you reach Natla's Mines.
Behind the waterfall there's a hidden passage. Go there.
Grab the pole. And continue on the ledges.
When you reach the last one, do a back jump onto the crate.
Go up the rope holding it up.
Jump on the next.
And then on the free rope. Swing with it, and grab the ledge on the other side.
Go around, and do a back-jump.
And you're in the tunnel.
At the end you come across a giant cave. CHECKPOINT.
Move the crate near the wall of the building. You'll need it later.
Go on one of the paths that has two rats. Dodge them, and on top of an ore cart you'll find the red fuse.
Put it into the control room.
The crane will move the crate away from an entrance that was inaccessible.
Go on the crate, and up on the roof.