This is the last in a six-part series on the Fukushima nuclear catastrophe based on accounts of people who struggled to contain the crisis in its early stages.
Little is known about the death of a young worker at the Fukushima No. 1 nuclear power complex on March 11, 2011, but Satoru Hayashizaki will never forget that fateful day when he lost his comrade and good friend.
The body of Kazuhiko Kokubo, 24, was one of two found in the basement of the No. 4 reactor building after it had been swamped by huge tsunami that reached the plant about 50 minutes after the Great East Japan Earthquake struck.