Circe Launches Seal Island Cruise has a duration of between 40 and 60 minutes. Calypso, is the only glass bottomed open motorboat in South Africa, designed for passenger comfort and safety, with ample outside deck seating, upper deck viewing and comfortable inside cabin seating. During good visibility, passengers are able to get a first hand view of the kelp forests and the abundant sea life at Duiker Island/Seal Island. The boat's powerful engines enable crew to bring the vessel within metres of the island, for a really close up view of the Cape fur seals in their natural environment.