It was one of the most dangerous secret missions of the War in the Pacific: a coordinated US submarine attack against a Chinese arms shipment rumoured to be bound for Pakistan.
But as USS Oklahoma City sails towards the Chinese coast, she stumbles onto an even greater threat to the West. Outnumbered, isolated and alone, with tension aboard the submarine at breaking point, the OKC and her exhausted crew must battle to outwit the Chinese navy and then finally fight for their lives.