Over years of flying, it had been drilled into the crew to pull back on the controls when such an alarm sounded, but on this occasion the pilot took no action. The crew were prepared for their system to make spurious warnings and knew from experience they were still flying at a safe altitude.
Nihon Hidankyo, the grassroots group of Japanese atomic bomb survivors, won this year's Nobel Peace Prize for advocating nuclear disarmament and highlighting the horrors of past bombings.