Hotel Gandoca-Manzanillo Wildlife Refuge, Costa Rica; the Treetops Hotel in Aberdare National Park, Kenya; the Ariau Towers near Manaus, Brazil, on the Rio Negro in the Amazon; and Bayram's Tree Houses in Olympos, Turkey. Some hotels have accommodation underwater, such as Utter Inn in Lake Mälaren, Sweden. Hydropolis, project in Dubai, would have had suites on the bottom of the Persian Gulf, and Jules' Undersea Lodge in Key Largo, Florida requires scuba diving to access its rooms. A resort island is an island or an archipelago that contains resorts, hotels, overwater bungalows, restaurants, tourist attractions and its amenities. Maldives has the
Underwater habitat of with a hatch depth of . The lagoon contains artifacts and wrecks placed there for education and training. From 1993 to 1995, NASA used MarineLab repeatedly to study Controlled Ecological Life Support Systems (CELLS). These education and research programs qualify MarineLab as the world’s most extensively used habitat. MarineLab is also used as an underwater laboratory for excursions and underwater laboratory training for recreational and sport divers who stay under the sea at the Jules' Undersea Lodge. MarineLab is currently located next to the Jules' Undersea Lodge, which is actually the La Chalupa Research Laboratory converted into a luxury