James goes to the depths with Germany's Wolf Packs, the U-boats, the force that most threatened wartime Britain's survival - from suicidal, one-man torpedoes to the potentially game-changing Type XXI.
James goes to the depths with Germany's Wolf Packs, the U-boats, the force that most threatened wartime Britain's survival - from suicidal, one-man torpedoes to the potentially game-changing Type XXI.
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