Virtual reality aquarium. Virtual reality view of the main tank of the Lisbon Oceanarium in Portugal, the largest aquarium in Europe. The virtual Oceanarium is part of Expo 98, which is themed around the oceans. As well as the main tank, a graphics supercomputer also simulates sea life in the Oceanarium's Atlantic, Antarctic, Pacific and Indian Ocean habitats. The different tanks are seen in three-dimensions from the point of view of a insdiverins who interacts with the fish. The virtual Oceanarium contains 1000 sea creatures programmed with realistic instincts and behaviour. It was developed at the Fraunhofer Institute for Computer Graphics in Darmstadt, Germany.