Back when I first got this game I was patrolling in the moth yards, I at the time had the patrol mission to study the cave that you have jump off the broken plane wing to get to. At the time I was new and didn't know about the plane wing entrance and tried to get through the bottom entrance, but couldn't jump high enough. Eventually I gave up and started summoning my sparrow as I turned around. My sparrow glitches threw the wall and under the map into an endless death loop. Needless to say I did not complete that patrol mission