Under Ten Flags (1960)

Set against the stormy backdrop of 1941, the British Admiralty is on edge as an enigmatic enemy vessel wreaks havoc on Allied ships in the Pacific Ocean. At the helm of suspicion is British Admiral Russell, initially attributing the destruction to a German submarine. However, as the mystery unravels, it becomes evident that the culprit is a surface warship from the German Navy. The enemy ship in question, the cunning German raider Atlantis, is commanded by the shrewd Captain Rogge. The Atlantis' phenomenal success lies in its uncanny ability to transform into an inconspicuous, harmless vessel. With a clever mix of camouflage, props, paint, counterfeit foreign flags, and even dramatic crew costumes, the Atlantis masquerades as a neutral ship, slipping undetected under the radar of the enemy. Once in close quarters with its unsuspecting prey, the Atlantis sheds its disguise, revealing its true, lethal identity before unleashing a barrage of fire on the duped victim. With realization dawning, Admiral Russell formulates a plan to draw out the elusive enemy. He constructs an elaborate trap, persuading the Atlantis to disclose its position to a fleet of British warships lying in wait. However, gaining the Atlantis' trust is no easy feat. Admiral Russell must convincingly mimic the German Navy High Command, sending messages through their complex Flower Grid Code Map system - a challenging task that sparks a thrilling game of maritime cat and mouse. With each move and countermove, the tension mounts, the stakes rise, and the waters of the Pacific become the stage for a deadly dance of deception and warfare.

Under Ten Flags is a history movie featuring Van Heflin and directed by Duilio Coletti.

It is possible to buy Under Ten Flags on Amazon Video, Apple TV, Google Play Movies, Vudu and YouTube.