十名地球囚犯被流放在充满危险的星球XT-59,为了生存他们需要踏过大片沼泽地到达幸福岛,这个星球唯一的安全区,恶劣的天气和来自地下的恐怖生物是威胁他们生命阻止他们前进的最大障碍。。Marine scientist Fred Miller designs the world's first underwater home, but when the business magnate funding his work threatens to end the project, Miller volunteers to live in it with his own family to prove it's practical. The underwater clan includes his water-phobic wife and his daughter and son, who are part of a rock and roll band. They bring along the lead singer and drummer. Along the way, they have to contend with a competing engineer who promises to mine the ocean floor for the businessman. A record producer likes their music and books them on TV, leading the kids to try to escape to the surface.。