Now Laguna is in a mine. Make sure you map out where you are, because it's a little confusing in here. Find an old key in the room with the sawhorses. In the room with the floor-plates, use the switch on the center one. Now move right and then trigger the switch on the right. Keep going right and look for another old key. Head along up a ladder and you'll get back to the plates. Now fiddle with the left one. Now go back to where you found the second key and then go forward and up the top branch.

You'll find a detonator - do the red and then the blue switch. Go up and look at the boulder, there's a draw point. Head out for the final battle.

Final Fantasy VIII Walkthrough