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There are 2 videos that I know of from the same guy. One can be done by yourself in single player and online, and the other requires two people.

Solo:
[ame="https://www.youtube.com/watch?v=NQTWiCLIa0Y"]YouTube - Out/Under DER RIESE! [SOLO] [NO MODS][/ame]

Two:
[ame="https://www.youtube.com/watch?v=xq5vbI6EQas"]YouTube - UNDER/OUT of DER RIESE!!!!! [PS3] [NO MODS] (With 1 Zombie)[/ame]