How do you unlock the third black ops zombie map?

Send your xbox to me. I'll do it for youHow do you unlock the third black ops zombie map?
you get 1 at the start

you get 2nd after beating campaign ( Pentagon level )

You get 2 other maps for buying the limited edition that was 80 or 150 dollars. Those are the older maps

You get dead ops by typing DOA into the computer at the menu, When in the chair at the main menu use the right stick to look down at your hands. Hit the trigger buttons to wriggle out of the restraints. L2 and R2 for ps3, or LT and RT for 360. Then walk to the computer behind the chair and access it. Typing DOA gets the top down zombie levelHow do you unlock the third black ops zombie map?
you start the game and at the main menu...you tap the triggers until you bust out of the chair..you walk around till you see the computer walk over to it and type in doa. and it should start right up..