new mw3 survival glitch

In the new free dlc map terminal i have discovered a cool glitch. on the way up the blow up escape route on the airplane run on it and jump to the left near the wing but go on the crate. Then go prone and crawl towards the wing. you will all into a glitch area and can get kills but you cant be killed. This only works in survival mode. Its best to have a co op partner so you can get ammo