Waterworld (1995)

In 2500, as a result of the sea levels rising over 8,200 metres (26,900 ft), every continent on Earth is now underwater. The remains of human civilization live on ramshackle floating communities known as atolls, having long forgotten about living on land. People believe a mythological “Dryland” exists somewhere in the endless ocean. The Mariner, a lone drifter, arrives on his trimaran to trade dirt, a rare commodity, for other supplies. The atoll’s residents see that the Mariner is a mutant with gills and webbed feet and decide to drown him in the atoll’s recycling pit, a kind of liquid compost facility.

Just then, the atoll is attacked by the Smokers, a gang of pirates seeking a girl named Enola who, according to their leader, the Deacon, has a map to Dryland tattooed on her back. Enola’s guardian Helen attempts to escape with Enola on a gas balloon with Gregor, an inventor, but the balloon is released too early. Helen instead frees the Mariner and insists that he take the two of them with him. The three escape to the open sea aboard the trimaran, pursued by the Smokers. They escape, but Helen’s naïve actions result in damage to the Mariner’s boat.