There's another rather inexplicable scene where the head bad guy offers a cigarette to Girl. This guy must be really rich if he has enough dirt to waste some on growing tobacco. Somehow this guy comes to the conclusion that the tattoo on Girl's back is a map to the Dry Land. Eventually, Gill-Guy and Woman rescue Girl. Someone comes up with the idea that not only is the tattoo really a map, it's a backwards map.
North is South and East is West.
They do, Gill-Guy drops Woman, Girl, and a couple other guys who have hooked up with them through the course of the movie off on the shore, and then he sails away. What makes this movie even more pathetic is the fact that at its time, it was the most expensive movie ever made. It's filled with plot holes and half-baked ideas. Still, the movie is too boring and slow and inexplicable to be very entertaining for a bad movie lover. From what I remember, there's enough water in the ice caps to cover quite a bit of today's coastal areas but not nearly enough to flood the entire world.