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Now, run/jump/float across to a broken catwalk. Once you make it there, you'll need to get to the edge and you'll see a girder sticking out. Double jump to reach that and then double jump to the broken catwalk in front of you. This is the echo that is directly above the o2 pump/secret room.
(Thanks, Vilagefool - great write up.)
Shoot the little box next to the jump pad.