U.S. Air Force Bombers Blast Nazi U-Boat Base At St. Nazaire. This reconnaissance photo shows the bomb-devastated area of about three acres each on either side of the entrance to the Nazi U-boat base at St. Nazaire in occupied France following a raid by heavy bombers of the U.S. Army Air Forces. Wreckage and debris can be seen on either side of the narrow channel loading into the basin. This attack was one of 46 successfully carried out by Allied flyers against the submarine shelter. August 9, 1