You mean for people? The first underwater restaurant is called the "Ithaa", which means pearl in Dhivehi. It was opened on April 15, 2005. Source: http:/en.wikipedia.org/wiki/Ithaa
It's the first underwater restaurant
Ithaa, the first ever restaurant under the sea in Rangalifinolhu, Maldives was concieved by the Crown Company who leases the island of Rangali (home of Ithaa restaurant) to Hilton Maldives Resort and Spa. There is no one particular owner of Ithaa. For those who aren't familiar with that stuff, or if you are about 5-9, you can use a better example. Mr. Eugene Krabs owns the popular Krusty Krab, which dominates over all Bikini Bottom competition (Chum Bucket, Diner, Fancy! Restaurant).
Undersea volcanoes that erupt.
Undersea Fleet was created in 1956.
Undersea Quest was created in 1954.
Undersea Trilogy was created in 1992.
Undersea City was created in 1958.
The duration of Undersea Kingdom is 3.77 hours.
Undersea Trilogy has 501 pages.
Jules' Undersea Lodge was created in 1986.
Some islands may be built by undersea volcanoes.