Re -"It almost looks like a movie set to me."
Apparently it is.
Those guys tied to the posts look entirely too healthy to me to be for real.
Sort of like the movie about the "Andersonville" Civil War prison camp.
In order to portray what those Prisoners went through, you'd have to cast most of the Actors and Extras from men who were anorexic or dying of AIDS and weighed no more than 75 pounds or so. They were little more than skin over skeletons, and most if not all of them were suffering and dying from dysentery to boot.
Confederate Prisoners up in Yankee Prison camps towards the end of the War didn't make out much, if any better.
Union Commanders deliberately starved them as sort of a sick form of retaliation for the attrocities of the South.
I would not expect much better treatment from the VN OR the Chinese Reds, for that matter.