You may be interested in the 1945 Project - which collects the stories of hibakusha,[1] or atomic bomb survivors: https://www.1945project.com/

There is also Yoshito Matsushige, a survivor and the only photographer who was able to capture an immediate, first-hand photographic historical account: https://ahf.nuclearmuseum.org/ahf/key-documents/yoshito-mats...

[1]https://en.wikipedia.org/wiki/Hibakusha