Based on this tut: [link]
Stocks: [link] [link] [link] [link] [link] [link] [link]
For those who have problems with the water bursting into the room:
1. This is a fantasy manip, and as such it has nothing to do with the real world.
2. No one says that the room is totally sealed, so the water can flow in and out of it, it all depends on the pressure differences.
3. Why is everyone stucked on the "waterfall" when there's a girl happily swimming in an undersea room full of water?