The Hydropolis Underwater Hotel and Resort is a proposed underwater hotel in Dubai. It would be the first multi-room underwater hotel in the world. The original plan was to locate it underwater off the coast of Jumeirah Beach, although this site was later found to be unsuitable. The hotel's plan is to cover an area of . Originally announced in 2005, the plans had been put on hold by 2014. Origin The hotel was planned in the Persian Gulf off Dubai through the mediation of the Hans Peter Pesenhofer following plans of Siemens IBC (Prof. Roland Dieterle) in cooperation with the German Designer Joachim Hauser (Bitterfeld) and with the approval of the DDIA. The hotel's original plan was to be located 20 meters underwater off the coast of Jumeriah beach. The hotel's plan is to cover an area of 260 hectares, which is equivalent in area to Hyde Park in London.[1] The construction cost for Hydropolis is approximately €600 million Euro, which will make Hydropolis one of the most expensive hotels ever created.[2] The hotel design was created by Joachim Hauser and Professor Roland Dieterle, and is planned to be composed of three segments: a land station, a connecting train, and the underwater hotel. Joachim Hauser's and Prof. Roland Dieterle's architecture idea is to represent the connection between humans and water. The initial planned opening year was 2006, but due to financial reasons and disagreements with the DDIA (Dubai Development & Investment Authority), the project was canceled by the DDIA already in October 2004. Hydropolis Holdings LLC Dubai was holding the original intellectual property rights of Hydropolis. Land station The design of the land station is a wave-shaped 30,000 square meter building. The purpose of the land station is to provide a place for guests to board the soundless train to descend into the hotel. Secondary purposes for the land station include greeting guests, and use of the land station's facilities. The land station is planned to feature many facilities, including a marine research laboratory, a plastic surgery clinic, conference facilities, a restaurant, and a theater. The theater is intended to feature films about the evolution of life and about the history of underwater architecture. Power and tunnel The noiseless train will be located in a , transparent, double-track tunnel, made of plexiglass reinforced with concrete and steel. This train will be powered by an automated cable propulsion system. This