Explore the underwater wonders of Curacao in our Semi-submarine SeaWorld Explorer The SeaWorld Explorer is a state-of-the- art air-conditioned semi-submarine. The vessel always remains above sea level and accommodates up to 34 passengers comfortably in its hull, which sits 5 feet below the surface. Huge glass windows provide spectacular views of the many different varieties of corals and fish which Curacao is famous for. In fact, the fish come right up to your window, making it easy to snap that memorable photo. A special diver swimming alongside the submarine will be feeding the fish. No scuba or snorkel gear is needed, you will remain dry at all times.