You can repair broken fortifications with your back turned to them, so you can cover another entry point while you rebuild! Zombies will start breaking through the mortared wall in the Help Room at level 5, and on level 10, I suggest you get your butt upstairs! Zombies are sneaky, especially the crawling ones, you never know when one (or ten) might be creeping up on you. I leave you with a few tips for survival against the hordes of undead. Nacht der Untoten (Night of the Living Dead) is definitely one of the best zombie mods for a first person shooter that I've played to date.
In this mode, players are stationed in the bunker building on the Airfield map at night time, defending themselves from the risen corpses of their Nazi foes. For beating the Call of Duty: World at War campaign missions, you are rewarded with a bonus game mode, Nazi Zombies.
