Make it so Zombies can not get to you in World at War

Note: 3 Players are Required to Perform this Glitch
(Must be on 1st Nazi Zombie Map)
1. Unlock upstairs.
2. 3 People must go to the white box-like thing near the stairs.
3. Tada! Zombies cannot reach you.
Note: May take a try or two for it to work

View More Call of Duty 5: World at War Glitches