The new movie is a follow-up to Lam's action-packed Operation Red Sea, loosely based on China's evacuation of stranded ...

His ship encounters and sinks an American yacht and the single survivor, Sue Curry, is rescued by an American submarine, the "Sea Serpent", commanded by Commander Chris Warren. He hears her story ...

However, things change when one the men is in a submarine trapped beneath the ocean and the other, a diver, is sent down on a rescue mission.