Sumiteru Taniguchi, who devoted his life to seeking to abolish nuclear weapons after he was burned severely in the 1945 atomic bomb attack on his hometown of Nagasaki, died Wednesday of cancer at age 88.

Taniguchi died at a Nagasaki hospital of cancer of the duodenal papilla, the point where the pancreatic and bile ducts meet, according to the Japan Confederation of A- and H-Bomb Sufferers Organizations.

Taniguchi was 16 and delivering mail on Aug. 9, 1945, when a U.S. atomic bomb was dropped on the city. The blast 1.8 kilometres away threw him from his bicycle, almost killing him. The Nagasaki attack killed more than 70,000 people. The bombing of Hiroshima three days earlier left an estimated 140,000 dead.

He could only lie on his stomach for nearly two years as he was treated for the burns that exposed flesh and bones. He later formed a survivors group, the Nagasaki Atomic Bomb Survivors Council, and had since led a national effort against nuclear proliferation.

Japan A Bomb One Man Scars Photo Essay

Taniguchi, shown in 2015, lived with a web of wounds covering most of his back, and the remains of three ribs that half rotted away and permanently press against his lungs, making it hard to breathe. (Eugene Hoshiko/Associated Press)

In an interview with The Associated Press two years ago, Taniguchi peeled his undershirt off to show his scars, to describe his painful past and tell the world the tragedy should never be repeated.

He said he wanted no one else to have to suffer the pain of nuclear weapons.

His health declined in the last few years from age and illnesses.

In his video message in July, Taniguchi welcomed the UN nuclear weapons prohibition treaty, but expressed concerns about the declining population of the survivors, known in Japan as hibakusha.

“I wonder what the world will be like when it loses the last atomic bombing survivor.”