In times of conflict, controlling the sea often means controlling the war. We tell the stories of some of history's most remarkable combat ships as well as the men and women who sailed them into battle. From Viking longships to missile-carrying destroyers and from stealth, covert conflicts to the greatest sea conflict of all, the Battle of Leyte Gulf in 1944, we reveal the secrets of these extraordinary vessels and the remarkable maritime missions they carried out through rarely seen combat footage and firsthand veteran accounts.