...and explore the rainforest of the sea - a coral reef. The "Siren" salt water aquarium takes you on board a Danish frigate shipwrecked in the West Indies in the 1700s. She was on her way to the Caribbean with a cargo of slaves when something went wrong and the ship ended up on the sea bed, where it now lies amongst psychedelically-coloured fish, coral, sea anemones and other aquatic curiosities.