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On AOTCR when you use the pelican glitch at the begining on co-op mode you have the first guy jump out then as the second guy in the pelican get's low enough your freind spawns on the little rings and you can jump around on these rings forever.
i prefer going all the way down, and trying to get past barrier/listen to funky music. but really, the only time i go down is when my shade jump goes south
i know a glitch it hard but its worth it you know assault on the control room you can get down alot faster to the warthog when you get to the door turn left and jum on the platform under note: you need multiplayer to do it goand kill your friend an go to the edge on ythe right and then jump off try to land on the edge and you will see that your friend has teleported on then look for the rest of the way down then if you do it quick enough you can jump on the pelican there
Try geting a banshee in the first room and gonig down there. Don't tell me it's imposible!!!! You can melee it through the hallways if someones in it.