This is so unusual and coincidentally well done this dream...
I was playing Call of Duty - Black Ops Zombies, there was a new map called "115", it was a giant prison and facility of some sorts, so, well, this map is called "115" because of the Element 115 from the Call of Duty Zombies series, but not only that, this map starts at round 115!
There are SO many zombies right at the beginning, at least their health are basicly starting with wave 1's health, the starting room is a big and open jailhouse, not like Mob of the Dead's which is some-what cramped, but this like, very open like i said.
Proceeding to the west, there is like, a place that looks alot like it came from those HL2 canals chapter like, sewers, this room is long, it is tall, and it looks like a sewer (it is not the typical circular sewer tho), and standing there for a while seems to trigger a giant stream of cold water, that freezes you and insta kills you, it is supposted to be an effective trap for zombies, where they also are insta-killed with this giant and strong stream.
Heading south in that room, then east, you can buy a door for a room that looks like that facility, it is basicly Area 51 from the map "Five" in Black Ops Zombies, but more open and bigger, somewhere in it, i don't remember where, there were more prisons that looked very tall and big and had lots of floors, and also a basketball court somewhere, i do not remember as well, this map was very intense while i was playing due to the large amount of zombies right at the beginning while i just have a wimpy pistol.
Well, i got a M16 that is already coupled with a grenade launcher through a wall buy somehow, without Pack a Punching
, and tried to get all those zombies to that last mentioned tall prison, i was also making trains in the facility in the meanwhile, very intense zombies from all sides coming it, nading them all with the M16 proven to be quite helpful, then i went to the tall prison, make a train out of it everywhere, the whole room was almost full and crowded of zombies, so i kept spamming grenades, and also kept using the grenade launcher, it was very satisfying and effective, yet very intense...
Then that is about it.