I Found A Glitch That I Used

What Sucks About It:
Hard To Get Max Ammo
U will Have To Move Out Of The Spot To Get Stuff

Whats Good About It:
Zombbies Cant Kill You ... Ever
You Can Prone, Crouch, Or Stand

How To Get In It:
If You Know Where The Tumbstone thingy Perk Is Then Find Where The Lava Pit Is
And You Know Where You Jump Near That Perk, The Jump Is Right Next To It
If You Fail Then You Fall Into The Lava Pit. Get On The Side That Is Closer To The Perk
And Get Back A Little. Start Sprinting... And Hold B (dive) When You Get Around The Boxes
And It Will Look Like You Missed But Something Will Catch Your Fall.
I Guess Ill Post A Legit Video On How To Do It:

By The Way Its The Second Glitch - its awesome. really easy