He’s been working on some information-theoretical problems occasioned by the Royal and U.S. Navies’ recent propensity to litter the floor of the Atlantic with bombed and torpedoed milchcows. These fat German submarines, laden with fuel, food, and ammunition, loiter in the Atlantic Ocean, using radio rarely and staying well away from the sea-lanes, and serve as covert floating supply bases so that the U-boats don’t have to go all the way back to the European mainland to refuel and rearm. Sinking lots of ’em is great for the convoys, but must seem conspicuously improbable to the likes of a Rudolf von Hacklheber.