I can't remember the title of the book but it is along the lines of the escape of LT so and so. Its the story of a British officer that escapes the Japanese in the Malaysia/Burma area and manages to walk back to India. He came very close to not making it not because of the Japanese but because of the jungle.
At the opposite end of an escape was the rescue of civilians from the Japanese in the PI close to the end of WWII. Forgot the name of the place/raid.
Then there was the raid on Son Tay(sp) POW camp during Vietnam that worked except the POWs had been moved just before the operation.
There where also escapes from German concentration camps.
I'm sure everyone except the younger folks can remember the Iran Hostage rescue failure.
I think POW's in the US Civil War also managed to escape but I don't think I have ever read the particulars just that they did. The survival rate of a POW in the Civil War was not good.
In the Korean War, the chances of survival as a POW was 50/50 if you where in the USN/USMC. A member of the Army chance of survival was about 25%. There was a book on this which I have been trying to find for years but the theory was that the mental resiliance of the USA soldier was lower then the USN/USMC. Most of the USN POW where pilots and the USMC where veterens from WWII whereas the USA soldier was likely a draftie. The USA soldier also did not have a sense of belonging to a unit/group like the other POWs. There also where higher numbers of USA POWS. UK POWs survived at the USN/USMC rate.
I read a story of a DR who was a POW in Korea. There was a man in the camp who had a festering wound that would kill him if it did not heal. Since the Koreans barely fed the POWs medical care was not going to happen. The DR took the man back to the latrines and had him turn his head away from the arm. What did the DR do? He let flys land on the wound and lay eggs. He wrapped up the arm and let the eggs hatch into maggots.

Maggots will only eat dead flesh. The man lived.
Survival of in a Japanese camp was pretty low as well. Not only because of the length of time many POWS had to serve but also the beatings and torture that went on day after day. Pappy Boynton, the lead USMC ace who was shot down and captured, was beaten with a baseball bat. He had to stand at attention while the guards hit home runs.
Even these survival rates are better than what a German POW in Russia could expect. 95% of German POWs never made it out of Russia. Stalin kept them for 10 years or so after the way before letting the survivors go back to Germany.
Later,
Dan