A cat‑5 stalls over the Gulf; sirens die and basements turn into bays. Millie Bobby Brown plays Rae, a former swim champ home to help evacuate—until the levee fails and a lattice of sinkholes opens under her town. With a handheld radio and a soaked go‑bag, she charts a high‑ground route for trapped neighbors… and discovers an alligator farm has overflowed.

Set pieces snap: a supermarket walk‑in freezer afloat like a raft, an elevator shaft filling into an aquarium, a motel crawlspace that breathes, and a stadium tunnel where lane ropes become lifelines. Flares hiss, jaws slam, rain roars; thermal cams catch yellow eyes sliding beneath cars. Rae fights smart—duct tape, rebar, timing—counting breaths more than seconds. When floodlights pop and the water goes black, the trailer holds on her whisper: “On my count.” Final sting: a grate bends, a shadow blooms, and the storm answers with teeth.