Well I had this dream some time ago
I was walking on top of a glacier, when I suddenly fell through, and into a cave sort of speak, the cave was huge and there was about 30 cm of water at groundlevel. In the end of the cave I could see a big iceplatform with several sharp ice thingies facing upwards, suddenly the platform fell down and the cave started flooding. The next thing I know, I'm being taken by a gigantic tidal wave through an entire city, leaving it submerged. I finally reach the end of the city, and the wave is stopped by some wall, and I land on the other side.
When I reach the other side, I get onto to a bus to get out of there, and it drives around the flooded city and to the docks, huge ships, containers etc, but the road is blocked by abandoned busses and cars and some containers, then I seezombies scattered around the area of the busclosing in on the bus and everyone on the bus runs outside trying to get away, and so do I
As I see most of the bus passengers getting attacked by the zombies, I run like hell towards a huge house to my right, I manage to get inside and I continue to run like hell, trying to get through the house, but the house seems endless and incredibly complicated and I run through room after room and floor after floor but no way out.
At the end I find the way outside, which is near the sea with very brown looking water, and I can see a platform a little out in the sea, which consider swimming to, to get away from the zombies, I then conclude with the lack of supplies and that zmbies might be able to move in water that I shouldn't and look towards the flooded city and realize that isn't a good option either.
I then either return to the house, or go to an outhouse right by and venture in, the room or outhouse is a gigantic library with /\ shaped glass roof and a fireplace in the far end. I then notice a table infront of all the other books, with three different books, the one in the middle is a black bible, I open it there is only one page, at first I can't read it, as the text is cryptic or scrambled, but then I can see the words, You can do both.
Then I woke up.