<P> 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 . </P> <P> The noiseless train will be located in a 515 - meter - long (1,690 ft), transparent, double - track tunnel, made of plexiglass reinforced with concrete and steel . This train will be powered by an automated cable propulsion system . This automated cable propulsion system consists of a stationary motor and cables with the train cars fixed to the cables . The stationary motor for the train system will be located in the land station, and will be connected to cables running down the length of the tunnel . The train cars, fixed to these cables, will be moved up and down the tunnel solely from the power of the land motor . This system is advantageous because separating the motor from the train cars will decrease noise in the tunnel . This decreases noise because the motor is the main source of noise in this train system . With the motor separate from the train cars, noise in the cars and tunnel will be minimized . Another advantage of this system is that a separate motor results in less mechanical parts in the car, which also mean less repairs on the actual train cars . </P> <P> Rubber wheels were chosen over other types of wheel, such as steel, to minimize noise . Rubber wheels have a property of making little noise as they roll on surfaces such as plexiglass . The noiseless train will serve two purposes, transferring guests and supplying the underwater hotel . Supplies will be packed on land, and delivered efficiently to the hotel to minimize the space taken up by goods in the hotel . Cars transferring supplies will feature palettes, and cars transferring passengers will provide a view of the ocean . The guest transporting aspect of the train will have a maximum efficiency of 1000 people per hour . </P> <P> The underwater hotel will be a jellyfish like structure The underwater hotel will be located 20 meters underneath the surface of the ocean . To handle the underwater pressures, the hotel's main structure is a dome composed of plexiglass, reinforced with concrete and steel . The underwater hotel will be composed of 220 underwater suites with a cost of $5500 per night . In addition to the underwater suites, Hydropolis is planned to have many other underwater accommodations including restaurants, a spa, a cinema, a ballroom, and bars . The underwater hotel is planned to not only be a place for regular guests, but also a place for visitors to explore . In addition to regular guests, the underwater hotel expects 3,000 visitors per day . </P>

How did they build the underwater hotel in dubai