The U.S. Navy needs help locating a renegade submarine in the Pacific Ocean. A World War II German U-boat commander is asked to lend his expertise in hunting down this submarine. He coaches the officers about the sub's possible maneuvers to attack their frigate. Navy frigate USS Barbey is selected to search for the sub. However, with just a skeleton crew, the frigate is plagued with mishaps, including torpedoes fired by the submarine they seek. A Chinese destroyer gets involved demanding the release of the submarine. Naval tensions rise between the destroyer and the frigate. A nearby New Zealand frigate fires a salvo and the Chinese leave the area. The skipper of the USS Barbey is promoted to Captain and sent on another mission advising an Indonesian frigate demanding the Chinese leave one of their islands. A naval battle ensues. Filled with intrigue and excitement, On Dangerous Water is a story of adventure as battling naval ships fight for their right to own the untamable high seas.