Sea Base 2000, situated on the aquatic world of Praya, drew in many tourists. It offered guests access to marine-speeders, which they could use to compete in races or explore submerged vessels in search of valuable items.
The post-ride queue video on the Tourscan for the Tokyo Disneyland iteration of the original Star Tours ride referenced Sea Castle, showing footage of the Sea Castle optional conclusion from the now-defunct Epcot attraction, Horizons.