U-Boat Wargamers - Season 1 Episode 2 -

After the fall of France in 1940, Dönitz’s trio of Kriegsmarine U-Boat aces embark on a race to send British merchant ships to the bottom of the ocean, converging on merchant convoys in co-ordinated wolfpack attacks. In Britain, an increasingly desperate Admiralty sends for Roberts, at last willing to entertain his newfangled wargaming ideas to try and identify ways of thwarting the deadly U-Boat wolfpacks.