. >> reporter: the photo was taken by army cameraman yosuke yamahata.e was ordered to record the damage after the nagasaki bombing. yamahata arrived on august 10th the day after the bombing and captured images of ground zero. a train was flattened and the bodies of the passengers were blown away. the girl in this picture lost her family and still staring in a daze. >> translator: it was like hell. there were very few survivors. people's eyes were exposed to radiation. their bodies burned. people were holding onto walking sticks wandering around the city waiting for rescue. >> reporter: amid this scene of devastation, yamahata saw the boy's body. more than 70 years later, the sisters were still searching for their brother. tanisaki lived at the boarding house around ground zero. he had taken exam at school on the day of the bombing. those were his last known whereabouts. >> translator: we went to exhibitions all the time. desperately hoping to find my brother somewhere. we looked through every photo very carefully. >> reporter: they had known about the p