Suggest a movie title for the following movie plot: After the melting of the polar ice caps in the 21st century, the sea levels on Earth have covered every continent on Earth. Four hundred years later, the remnant of human civilization lives on ramshackle floating communities known as "atolls", having long forgotten about living on land, though some believe a mythological "Dryland" exists somewhere in the world. The Mariner (Kevin Costner), a lone drifter, arrives at one such atoll on his trimaran to trade dirt, a rare commodity, for other supplies. The atoll's residents realize the Mariner is a mutant with gills and webbed feet, and decide to drown him in a brine pool. Just then, the atoll is attacked by Smokers, a vicious band of raiders who are seeking a girl named Enola (Tina Majorino) who, according to their leader the Deacon (Dennis Hopper), has a map to Dryland tattooed on her back. Enola's guardian, Helen (Jeanne Tripplehorn), attempts to escape with Enola on a gas balloon with Gregor (Michael Jeter), an inventor, but the balloon is released too early. Helen rescues the Mariner and insists he take the two of them with him. The three escape to open sea. They are pursued by the Smokers, and though they escape Helen's impetuous actions result in damage to the Mariner's boat and he angrily cuts her hair. As time passes, the tensions between the two females and the loner Mariner begin to ease. Later, Helen explains that she believes humans once lived on land and that Dryland must exist somewhere; when the Mariner denies her belief in Dryland, she demands to know where the Mariner collected his dirt. He assembles a diving bell and dives with her, showing the remains of a city and the soil on the ocean floor. When they surface, they find the Smokers have caught up to them, and the Deacon threatens to kill them if they do not reveal where Enola is hiding aboard the boat. Enola is tricked into revealing herself; the Mariner takes Helen and they dive underwater to avoid capture, with the Mariner helping Helen to breathe. When they surface, they find that Enola...
The answer to this question is:
Waterworld