Frank Munger’s Atomic City Underground, a blog by our sister paper the Knoxville News Sentinel, uncovered some previously undiscovered photos of then-Capt. Hyman Rickover, before he became father of the nuclear Navy. The paper obtained the photo at left, likely taken in fall of 1946, from Tim Gawne, who found it in the archives of Oak Ridge National Laboratory. Munger writes that most surviving photos of Rickover were taken after the launching of the first nuclear-powered submarine Nautilus in 1954. This rare photo, which escaped being destroyed with a batch of others, was taken while Rickover was the senior officer stationed…