Hell Below - Season 1 Episode 4

March 1943. Two Allied convoys, HX.229 and SC.122 leave North America bound for Britain. They total nearly 100 ships carrying vital food and raw materials to supply the Allied war effort. John Gordon Luther commands the short-handed escort group charged with protecting convoy HX.229. Short at least two ships, he lacks adequate defenses for the mid-Atlantic U-boat attack that the Karl Donitz, Gross Admiral of the German Navy, has in store for them. For three days the convoys are hammered by a merciless litany of torpedo attacks and an Atlantic winter storm. Many ships are hit and Luther is repeatedly torn between protecting the convoy or falling back to rescue survivors of torpedoed ships. It's the largest convoy battle of the Second World War and one that nearly costs the Allies the Battle of the Atlantic.