Thrash

Category 5 Hurricane Henry tears through Annieville, South Carolina, flooding the town from the inside out. Bull sharks ride the surge inland, drawn by blood leaking from an overturned meatpacking truck. Three groups of survivors are immediately cut off from each other: Lisa, a pregnant woman days past her due date, trapped in a flooding underpass as contractions begin; Dakota, her agoraphobic neighbor who watches from her window before forcing herself out into the storm to help; and foster siblings Ron, Dee, and Will, stuck in a flooding house with cruel foster parents who prioritize property over people.

Dakota wades and swims through shark-patrolled streets, using parked cars as stepping stones to reach Lisa's submerged vehicle. She smashes the window, frees Lisa from her seatbelt, and gets them both onto the car roof — sharks bumping and scraping the metal below — before making it back to her house on higher ground.

At the foster house, a bull shark crashes through the lower level and mauls Mr. Olson. Rachel is killed in the water. The kids retreat to countertops as sharks cruise through the ground floor. When a battered Olson resurfaces and tries to hit Ron, the siblings have had enough: they kick him into the kitchen. A shark finishes the job. The kids rig dynamite to T-bone steaks from the freezer, drop them in, and use the explosion to clear a path to Olson's truck.

Back at Dakota's, the house begins to fail. Walls crack, the roof tears away, and Lisa ends up floating in what was her living room — in full labor, in open water, blood drawing sharks in from every direction. She gives birth to a boy in the floodwater, clinging to debris, with dorsal fins circling closer.

Dakota finds a small boat and paddles to Lisa, but a bull shark rams and overturns it, throwing all three — mother, newborn, rescuer — into the water. Dakota fires a speargun to hold them off. Then, as one bull shark lines up a final charge at Lisa and the baby, a massive great white erupts from below: Nellie, the pregnant great white marine biologist Dale has been tracking offshore all film. She kills the bull shark in a breach and keeps moving. Lisa, Dakota, and the baby are pulled to safety.