No actual awnsers yet? Well in the books Cortana says that what she thought was an echo was not an echo, because it got louder. They discover this pelican on some asteroid/moon not crashed but seemingly parked. They dock and stuff and Sgt. Dude and some other people were there. Chips Dubbo and some 2nd guy also made it off of Halo in an as-of-yet unspecified way.