Underwater resorts

There are a variety of underwater accommodations that are already out there for travelers. Most of the accommodations are set only partially underwater, allowing them to continue to use normal electricity and plumbing, and maintain a normalized pressure so guests aren't uncomfortable when adjusting to changes in water pressure. However, they offer guests the unique opportunity to sleep under the sea.

The Underwater Room in Manta Resort 

The Underwater Room in the Manta Resort in Pemba Island, Zanzibar, is only accessible by boarding a wooden boat that takes you to the hotel floating in the sea. The deck is located above water, but your bedroom is sunken to give you views of the schools of fish. If you're feeling hungry, you can request catered meals from the hotel's main location on the island to be delivered to you by boat. Rates start at $1,500 per night. 

Underwater suits in Atlantis Palm Dubai

The Underwater Suites at Atlantis,Palm in Dubai offers luxurious underwater accommodations with large windows that feature up-close views of marine life. To access the underwater suites, guests enter the ground floor, located above water and descend three floors. The rooms come with one aquarium wall for viewing. Rooms start at around $5,000 per night.

There's also the Utter Inn in Västerås, Sweden, where guests reach their room by boat and climb down a ladder to a small but cozy underwater room, and Jules' Undersea Lodge in Florida's Key Largo, where guest scuba dive 19 meters (62 feet) down to their rooms.

Jules'Underwater Lodge

The oldest underwater accommodation is Jules’ Undersea Lodge, in Key Largo, Florida, which sits 21 feet underwater and is accessible by scuba diving to an opening on the bottom. This is why the hotel requires that you be certified in scuba diving to stay here. If you’re not, they offer a program on the premises for training. Rates start at $800 per night for a double room, which includes a scuba diving pizza delivery dinner, secured in a water-tight briefcase that's brought to you by a hotel diver.

In addition, there are several hotels set to open in the future.

The Poseidon Undersea Resorts
, set to open in Fiji, will feature 25 suites, an underwater restaurant and bar, a library, conference, room, wedding chapel, and a spa. Guests will be transported to their underwater accommodations by an elevator located at the end of the pier.

They also plan to have a three-passenger submersible submarine which guests can use to explore the ocean. 

The Water Discus hotel in Dubai, designed by Deep Ocean Technology, has a design plan which will include 21 luxury suites located in two main discs, with one being above water where guests will enter, and the other below.