Hydropolis, Dubai
Emirate of Dubai, United Arab Emirates
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 20 meters (66 ft) 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 260 hectares (640 acres). Originally announced in 2005, the plans had been put on hold by 2014. It is unlikely it will start up again.
Hotel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).