In a tranquil and idyllic coastal town, the summer relaxation is interrupted when a group of unusual aquatic creatures starts wreaking havoc. It all begins when a team of scientists investigates a strange phenomenon related to glacier melting, but what they discover goes beyond their worst nightmares. As the creatures, a mutant species of piranhas, begin to assert themselves, their voracity and ferocity are unleashed as they attack any living being that approaches their waters.
A young and brave scuba diver, who works as a diving instructor at the local resort, becomes the unexpected heroine as she starts connecting the dots between the attacks and the creatures. The tension escalates, and her protective instincts lead her to warn the unsuspecting tourists about the imminent danger. However, her warning falls on deaf ears. As the attacks by the piranhas escalate to grotesque levels, a group of locals joins the fight, confronting the lurking threat in the waters.
As the carnage claims more lives and the horrors of the deep sea are unleashed, courage and survival will be put to the test in a final showdown to reclaim their home. Amid sequences of heart-pounding action and a touch of humor, the story explores what it means to fight against the unknown, as the adventure turns into a struggle for life.