DrCaleb wrote:
I don't know how accurate it was, but the book "King Rat" by James Clavell and the movie by the same name were eye openers for me.
The Japanese were extremely brutal to their prisoners.
I read that when I was about 14. Peter Marlowe is loosely based on Clavell himself,
who was in Changi.
This is real:

Aitape, New Guinea, 24 October 1943: Sergeant L. G. Siffleet, M Special Unit, tied and blindfolded, about to be beheaded. Sergeant Siffleet, a radio operator, was part of a long-range reconnaissance unit led by Dutchman, Sergeant Staverman, operating behind Japanese lines in New Guinea. The party was betrayed and Staverman killed. Siffleet and two Ambonese companions – Reharin and Pate Wail – were taken to the Japanese base at Aitape where all three were executed by beheading on the order of Vice-Admiral KAMADA, commander of Japanese naval forces at Aitape. According to the original caption to this photograph the name of the Japanese executioner was YASUNO, who died before the end of the war. Siffleet was buried on the beach at Aitape below the tideline and his body was never recovered.
I don't think beheading would be so bad. Being stuffed headfirst down a latrine used by every member of the camp with dysentery, until you drown - that might not be so pleasant.