Igor Kurchatov, the Soviet physicist assigned to developing the first nuclear bomb for the U.S.S.R., reported to Deputy Premier Vyacheslav Molotov that the program had advanced significantly from secrets gathered in espionage on the United States [REF].
Six German submarines (U-43, U-375, U-461, U-462, U-504 and U-591) were all lost to enemy action on the same day.