Although "Akagi" sustained only one direct hit (almost certainly dropped by Lieutenant Commander Best), it proved to be a fatal blow; the bomb struck the edge of the mid-ship deck elevator and penetrated to the upper hangar deck, where it exploded among the armed and fueled aircraft in the vicinity.
"Akagi" was hit by just one bomb, which was sufficient; it penetrated to the upper hangar deck and exploded among the armed and fueled aircraft there.