In a post-apocalyptic future where the polar ice caps have melted, Earth is covered by water. A lone drifter, known as the Mariner, navigates this vast ocean in his trimaran. He possesses a rare genetic mutation that allows him to breathe underwater. When he discovers a woman and a young girl seeking a mythical dry land, he reluctantly becomes their protector. As they are pursued by a ruthless pirate, the Mariner must confront his past and fight for their survival in a treacherous world.
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