Tsutomu Yamaguchi, a Japanese marine engineer, is the only person officially recognized by the Japanese government as surviving both atomic bombings in August 1945. He was roughly 3 kilometers from ground zero in Hiroshima on August 6, then returned home to Nagasaki just in time to experience the second blast on August 9. At least 160 people are believed to have been affected by both bombings, but Yamaguchi is the sole person to receive formal double recognition.
The Hiroshima Bombing: August 6, 1945
Yamaguchi was a resident of Nagasaki but had been working in Hiroshima on a three-month business trip for Mitsubishi Heavy Industries. On the morning of August 6, he was preparing to leave the city with two colleagues when he realized he’d forgotten his personal identification stamp and turned back to retrieve it. At 8:15 a.m., while walking toward the docks, the first atomic bomb detonated about 3 kilometers away.
The blast ruptured both of his eardrums, temporarily blinded him, and left him with first- and second-degree burns across the left side of his upper body. He managed to crawl to a shelter, and after resting, went to find his two colleagues, Akira Iwanaga and Kuniyoshi Sato. Both had also survived. The three spent the night in an air-raid shelter, then made their way back to Nagasaki the following day.
The Nagasaki Bombing: August 9, 1945
Despite being heavily bandaged, Yamaguchi reported for work in Nagasaki on August 9. At around 11:00 a.m., he was in an office describing the Hiroshima explosion to his supervisor when the second atomic bomb detonated over the city. Once again, he was approximately 3 kilometers from ground zero. This time, he developed radiation sickness on top of his existing injuries.
The Nagasaki bomb exploded about 1,650 feet above the city, several miles from its intended target due to cloud cover. Yamaguchi survived a second time, making him one of the most improbable survivors of the entire war.
Long-Term Health Effects
The dual exposure took a serious toll on Yamaguchi’s body over the following decades. He lost his hair after the attacks. His burns remained unhealed for several years. He later developed cataracts and acute leukemia, both well-established consequences of radiation exposure. He ultimately died on January 4, 2010, at age 93, from stomach cancer.
Official Recognition Took Decades
Japan classifies atomic bomb survivors as “hibakusha,” meaning “explosion-affected person.” Yamaguchi was recognized as a hibakusha of the Nagasaki bombing in 1957. But it took more than 50 additional years for the Japanese government to acknowledge his presence in Hiroshima as well. That recognition finally came on March 24, 2009, making him the only officially certified double survivor.
The gap between those two recognitions reflects how difficult and bureaucratic the certification process was. Survivors needed to demonstrate they were within a defined radius of the blast, and Yamaguchi’s Hiroshima experience required separate documentation from a city he had only been visiting for work.
The Other 160 Double Survivors
While Yamaguchi holds the sole official designation, researchers have identified at least 160 people who were affected by both bombings. The overlap happened for a straightforward reason: many residents of Nagasaki had traveled to Hiroshima for work, military duties, or family reasons, and some Hiroshima survivors fled to Nagasaki before the second bomb fell three days later. These individuals experienced both blasts but were never formally certified as double survivors by the government. Yamaguchi’s case stands out because he actively pursued and eventually received that dual recognition, and because his story became widely known in the decades before his death.
Yamaguchi’s Later Life
For much of his life, Yamaguchi did not speak publicly about his experiences. That changed in his later years, when he became an outspoken advocate for nuclear disarmament. He lived to 93, spending most of his post-war life in Nagasaki, the same city where he had survived the second blast while standing in an office explaining how he had survived the first.