Me and my friends found a way to crash vertigo on any mode. (I did it in One Man Army).
Items Needed:
Mines
Written Instructions:
1. Get a friend and some mines and go to Vertigo.
2. Go to the left of the billboard and in the corner drop the mines.
3. Keep dropping the mines until your friend doesn't move.
4. You will be able to jump off the map and not die.
5. You can explore the bottom of Vertigo!!!!! /yea