The Deep is a public aquarium situated at Sammy's Point, at the confluence of the River Hull and the Humber Estuary in Hull, England. It opened in March 2002. Billed as "the world's only submarium", the exhibits contain thousands of sea creatures, 2,500,000 litres of water and 87 tonnes of salt housed in a building designed by Terry Farrell and built as part of the UK National Lottery's Millennium Commission project. The Deep is also a landmark centre for marine research.