The only one of its kind in the Caribbean, our air conditioned Undersea Observatory Tower stands 100 feet offshore.

Descend 15 feet beneath the sea to the Undersea Observatory and view the ever changing life on a natural coral reef. At mid-level, visit the Deep Reef Tank and, from the top level enjoy spectacular views of the St. Thomas shoreline and neighboring islands.

From the Undersea Observatory, you have a unique opportunity to stay dry and watch totally non-captive fish and other marine creatures as they go about their daily activities on the reef completely unaware of your presence. The scene changes frequently because the marine life here is free to come and go at will. You never know what might swim by – today a barracuda, tomorrow a turtle. Watch large schools of horse-eye jacks suspended in the current. Sometimes the tower is surrounded by huge schools of silversides. Watch hundreds of fish engulf our diver outside the observation windows during the daily feedings.

View a coral nursery demonstration site allowing you the opportunity to see how coral nurseries can work to help recover threatened Staghorn and Elkhorn coral species.

Or perhaps you would like to turn things around and be out there with the fish looking in. Then sign up for Sea Trek, the ultimate helmet dive. You can make your reservation at the kiosk on the top level of the Tower.

The Deep Reef Tank at mid-level (currently being renovated) contains a variety of schooling fish, sharks, tarpon and other large fish found in deeper waters.

The top level of the Tower is home to our reservations desk for all the Activities at Coral World. In addition to spectacular island views at this level, from December through March, you may get lucky and see a humpback whale and her calf breaching or tail or flipper slapping in the passage between the Tower and Thatch Cay. Humpback whales migrate to the Caribbean in the fall to breed and calve. In the winter, they begin their migration back to colder waters where they will gorge themselves during the summer.