My uncle also. He wrote a book about it, Late summer of 1941 and my war with Japan. He is still alive, and lots of family attends the memorial march.
The book is so understated it is almost ridiculous. He covers the bomb on Nagasaki (which he saw) in just 3 or 4 sentences. He went to the end of the war in their camps. He worked in the mines, was beaten, had TB, beriberi and pellagra, was bombed, had bowel surgery with just a shot of novacaine, and watched his friends die.
When I read the book, I can't understand how he survived. I wouldn't have lived two days. It's incredible.
Considering what they endured, it's amazing that there are any Bataan survivors still alive!