After his father´s death, Jay Gardiner travels to the Pacific coast to search for his remains. During a dive, his mission spirals completely out of control: first he is seized by a giant squid, which itself soon falls victim to a massive sperm whale. Jay survives the attack, but to his horror finds himself inside the enormous marine mammal. With a limited oxygen supply, a race against time begins, as he has only about an hour to find a way out. In this life-threatening situation, Jay must draw on everything his father once taught him. The memories of those hard lessons could be his only chance to win the fight for survival and escape the whale alive.