Key Largo’s Jules’ Undersea Lodge, the United States’ only submerged recreational hotel for divers, and its adjacent MarineLab Undersea Laboratory recently celebrated more than 30 years underwater in a Key Largo lagoon.

Jules’ Undersea Lodge initially was a research laboratory, one of the most technologically advanced habitats of its kind. It was renamed in the 1980s, with its name inspired by the novelist Jules Verne’s “20,000 Leagues Under the Sea,” and transformed into a two-bedroom retreat. Its entrance is 21 feet beneath the surface.

The lodge has hosted more than 10,000 overnight visitors. MarineLab’s educational programs teach about 5,000 students each year. The experience offers guests the world’s only Recreational Aquanaut specialty scuba diving recognition. Visitors who are not certified divers can take a short Discover Scuba course with an instructor.

For more information, visit http://jul.com.