From RT -
Yoshida said he feared they would die as debris from one of three explosions clattered on to the roof of their quake-proof concrete bunker. “At the time we didn’t know they were hydrogen explosions,” The Australian newspaper quoted him as saying. “When that first explosion occurred, I really felt we might die.”
AND THEY ALMOST STOPPED THE COOLING EFFORTS -
Many say Yoshida’s decision prevented an even greater disaster. In Japan, many view the former manager of the plant as a hero for refusing orders from his seniors to cease pumping the seawater into one of the stricken reactors.