go to the middle of acension with the banshee. flip the banshee on the path way between the banshee pad and the center of the map. flip the banshee like your doing the banshee jump.( you will ned overshields and rockets) now do the banshee jump and if you did it right you should fly past the banshee pad and fall to the bottom of the map. now you can walk around. this might take a couple trys but it's fun in the end.