1.get the power on and save 1 zombie so that you have time to do the glitch.
2. have one of your team mates cook a grenade to down himself and immediately when he goes down get on the lander and use it.
3. while its going have him crawl as if he is trying to crawl off the lunar lander.
4. pull the lag switch for a semi big lag and it will kick him off.
5. have your 3rd player or you if there are only 2 people run and revive them either by jump reviving or by using the krause refibulator.
6. sit back and own some zombies.
(P.S. if you dont unlock the path towards the claymore area and have good timing u can get the guy behind there so he can just shoot the zombies with the ak74u and get ammo whenever.)
(P.P.S. sorry for no proof video i dont have a cap card and if someone will help me ill get one up there.)