 A total of 3 different ships were used in this film: Seaborn Legend  (actual cruise liner; used for most exterior shots of the ship)  "Bridge Ship" (Sturgeon Atlanic frighter ship built with a false  hull and bridge; used for bridge scenes and the boat crashes in the  marina) "Rail Ship" (false hull built on an underwater rail; used  for the island crash finale scene). All other shots of the ship were  complete computer graphic effects.