The ex-head of Japan's Fukushima Daiichi nuclear plant Masao Yoshida, 58, died at a Tokyo hospital of esophageal cancer on July 9, 2013. Doctors have maintained repeatedly that Yoshida's illness has had nothing to do with exposure to high doses of radiation.
Yoshida is believed to have prevented the world's worst atomic accident in 25 years after the Chernobyl catastrophe in 1986.
After March 11, 2011, when an earthquake and tsunami struck the Fukushima nuclear plant, General Manager in the Nuclear Asset Management Department of the Tokyo Electric Power Co., Inc. (TEPCO) Masao Yoshida remained in charge of the rectification of the consequences of the disaster for more than six months, barely leaving the station.
Japan's Prime Minister Yoshihiko Noda (C) listens to Masao Yoshida, director of the Fukushima Daiichi nuclear power plant, while visiting the crippled plant in Fukushima prefecture on September 8, 2011 (Reuters / Prime Minister's Office of Japan/Handout)
It was Yoshida's own decision to disobey HQ orders to stop using seawater to cool the reactors. Instead he continued to do so and saved the active zones from overheating and exploding. Had he obeyed the order, the whole of north eastern Japan would possibly have been uninhabitable for decades, if not centuries.
After the catastrophe, the Japanese government ordered the forced evacuation of about 80,000 residents from a 20km no-entry zone around Fukushima plant which became unlivable.
On November 28, 2011, Yoshida was admitted to hospital, where cancer was diagnosed.
Five months after the tsunami, Yoshida testified to a government disaster investigation team.
In December 2011, he stepped down as head of Fukushima nuclear power plant.
He underwent several operations including an emergency brain surgery when intracranial bleeding was detected in late July 2012. He also suffered a non-fatal stroke.
Though it was announced later that Yoshida could not be questioned by prosecutors due to his failing health, the testimony he gave to the investigation team was thoroughly inspected as filing a criminal case against him was considered.
An aerial view of the third reactor building of TEPCO's No.1 Fukushima nuclear power plant at Okuma, in Fukushima prefecture on April 10, 2011 (AFP Photo/HO/TEPCO)
In August 2012, Yoshida went against traditions of Japanese corporate culture and recorded a video diary for human resources development consultant Hideaki Yabuhara.
"I felt we have to find ways to get our message across ourselves. We have to find ways to properly tell our experiences," he explained his position, because "the human element has been lost" from the many investigative reports written about the accident at Fukushima.
In the video Yoshida shared his feelings and fears towards the disaster.
He recalled the most tragic moments of the catastrophe, when he and his workers thought they would all die due to explosions of hydrogen that were collecting inside damaged reactor blocks.
"When that first [hydrogen] explosion occurred, I really felt we might die," Yoshida shared, adding that he believed that all those present at the site at the moment had been killed in the explosion. But when he found them alive, though hurt, "I felt awful for those injured, but I felt like Buddha was watching over us," he said.