Most guests luxury hotels are not thrill-seekers - but visitors to the Poseidon Undersea Resort will have to take a serious leap of faith.
The holiday complex is set to be located 40ft under the sea in a lagoon off the shore of a private island in Fiji.
It will house 25 suites, as well as a restaurant, bar, gym, and even an underwater wedding chapel.
Above the water will be 51 additional hotel rooms, as well as a number of restaurants and bars plus a spa, tennis courts and a nine-hole golf course.
But most visitors will surely be attracted above all by the stunning underwater seascape, full of stunning biological phenomena such as tropical fish and coral reefs.