Run around the outside of the arena area where the electric zapper is at the center using the walls for maximum cover.
You will come to a red brick corridor with a whippable bird head post in the wall above.
Go up. Whip another one. Once you cross, move in on the ledge where the grating is. Go around to the green lit corridor. Jump from ledge to ledge until you are on the white ledge that slopes down and has cave-in dirt behind you.
This is not an easy jump.
You want to run, start to slide, then jump all very quickly.