Secret map?

[marcasum]

On Survival, me and my friend were messing on dark carnival, the motel. We found that we could escape the map and get to the safehouse with the grenade launcher. We got through the map after that, and on the rollercoaster map, when you restart the round, it will take you to the start of the rollercoaster, where you start the hoard. It's all set up, with pipe bombs, weapons, health, and pills everywhere, but we didn't find it on the list of maps.

[Restless]

http://steamcommunity.com/sharedfiles/filedetails/?id=121828271