Board the Nautilus Semi-Submarine at Coral World's boat dock and begin your 45-minute exploration of the magnificent underwater world of St. Thomas. As the Nautilus cruises around the bay and coral reefs, you will explore the natural undersea coral gardens packed with myriad colorful tropical fish. Search the grass beds for turtles and stingrays from your personal viewing window. If you are really lucky, you may see a dolphin or two swim by. The Nautilus diver conducts a fish feeding in the water that brings the fish close to your window. Begin or end your Nautilus adventure with a self-guided exploration of Coral World Ocean Park.