The semi-submarine, despite its name, is just a ship but with a submerged passenger viewing deck, equipped with comfortable swivel seats, located in its' deep hull some three meters below sea level from which you can look down at the seabed through large clear panoramic windows. In real submarines large windows are not usually possible due to the problems of pressure at depth but because the viewing deck of the semi-submarine is close to sea level it is able to make extensive use of glass to create an experience for the passenger similar to scuba diving - without the need for any lessons or the risks of diving, you would love to see Portghalib's virgin coral reefs and exotic