The idea behind this is an ancient ocean with huge corals, which is now reduced only to a thin film around the planet. Perhaps some cosmic tragedy happened which caused this planetary extinction.
The landscape is build up from simple 3D-models combined with a complex displacement map. The characters and the vehicle are high poly models. The landscape was rendered in Vue along with a panoramic projection. This panorama was used later in Cinema 4D to create the lighting and the reflection for the rendering of the vehicle and the characters.