Reef. This was an unused 360 degree skybox environment for the computer game Unreal Tournament 2003. It didn't really work because movement would have been needed to pull off the illusion of an underwater world. It was created in Bryce with some coral pieces built in LightWave.

Fun Facts: While visiting Ireland with my family a few years ago we had to stay at a youth hostel for one night in Limerick because a local convention had taken all the available rooms in town for one evening.