Ozeaneum is the one of the biggest aquarium parks in Europe and opened July 12, 2008 in Stralsund, Germany. It took three years to construct and cost about 60,000,000 euros. ($89,442,000) Inside visitors can discover what is going on in a mysterious world that makes up 70 per cent of our planet's surface. With aquariums and exhibitions spread over some 8,700 square metres of exhibition space, visitors are treated to an underwater journey through the Baltic Sea, the North Sea and the Northern Atlantic, right up into the Arctic Ocean. A highlight at the Ozeaneum comprises life-size models of the Giants of the Seas. The exhibition, which was organized in conjunction with Greenpeace and its anti-whaling campaign, depicts giant models of whales hanging from 20 metre-high ceilings in rooms filled with whale song. Greenpeace donated 1.45 million euros to the whale exhibition. "We want visitors to see exactly what we will lose if whales become extinct," said Thomas Henningsen, who heads the Greenpeace project. The museum says the site contains the world's best library of whale books and data. The live fish at Ozeaneum will live in the 39 aquarium tanks, which have a total capacity of 6 million litres. That is enough water to fill a bathtub 60,000 times over. To ensure it is disease free, it will come from the city water system and have 200 tons of salt added to match the salinity of sea-water. The Ozeaneum is designed not only to showcase the beauty of the underwater world. Another of its aims is to use science-based information explained in lay terms to inform visitors about climate change, over-fishing and water pollution. The idea is to bring home the extent of threat faced by the marine environment and its life forms. During the opening ceremony, Chancellor Merkel stressed that the new museum gives people not just an insight into the wonderful world of the oceans and seas, but also to the dangers they face.