To climb a mountain

Felice Benuzzi, Dr. Giovanni Balletto, and Vincenzo Barsotti were all Italian POWs captured in Africa. They were interned in British POW Camp 354 within sight of Mount Kenya.

Life was very easy, security was lax; they were deep in British controlled territory. The POWs were able to come and go as they pleased and even do some gardening.

Life was also monotonous. They were bored. They had some mountaineering experience. So after staring at the mountain for months they decided to go climb it. They scraped together and hid supplies, cobbled together basic equipment, and made plans the best they could.

One day while working outside the fence they simply walked away. However, this wasn't an escape attempt. This was a holiday. They intended to come back. Being honorable men, and not wanting to get their fellow prisoners in trouble, they left a note letting their captors know they'd be back.

They climbed the mountain, and true to their word, they came back.

Felice Benuzzi published his account as No Picnic On Mount Kenya.

Duty, Boredom, Chance of Success

Why would a service member escape? A prisoner in a POW camp is, almost by definition, being kept by his/her captor as cheaply as possibly without actually being killed. A POW camp might have hundreds or even thousands of prisoners with a relative handful of guards. The more the POWs attempt even unsuccessful escapes, the more work and manpower the enemy must deploy to contain them. Manpower that could go to other aspects of the enemy's war effort. A successful escape (where the POW escapes the camp, not necessarily gets to friendly territory) is even more draining of enemy resources as you need to allocate resources into re-capturing the POW. Individually these actions don't take that much additional manpower/supply from the enemy, but then again neither does an individual rifleman on the front line. For example in WWII the Nazis ended up spending god-knows-how-much on specific camps for high-escape-risk POWs, with additional guards and security apparatus on top of the initial construction expense. Did that cause the Allies to win the war? Obviously not. But (to pick an arbitrary number) those 100 extra Luftwaffe guards meant 100 fewer guards pulling security elsewhere, which may have let partisans be more effective, or any number of additional knock-on results.

Boredom also plays a role. Especially for escape-minded officers, a POW camp is BORING. Sure you might have some books and a garden and decent food. But these guys tended to either be young and want adventure, or a huge sense of duty, or both. Sitting around waiting for the war to end when you KNOW that you can both complicate the enemy's life by trying to escape and know that if you actually make it out of the camp you might really get back to your side and into the war.

Which brings me to the last point. Allied troops captured by Germans (especially airmen) knew that if they got out, they had a chance to make it back home. Partisan movements in Nazi-occupied Europe were well known, especially to airmen who would have been familiar with the fact that RAF and USAAF crews had been returned to the fight after meeting up with partisans after being shot down. Conversely this is why you don't see a lot of escape attempts from Axis POWs in the US or Siberia, Russian POWS in Germany, or American/British POWs in Japan. Axis troops in the US/Siberia new if they escaped the POW camp their chances were essentially nil to make it home, same for POWs in Japan. For Russians captured by Germany, there was the belief that if they escaped and made it back to the USSR they'd be shot for being captured in the first place!

Get to the end of the book

I've also read this book. Towards the end of the war the German guards were ordered to kill all of the remaining prisoners in Stalag Luft III, and presumably the same orders were given to guards in other camps. In Stalag Luft III they declined to do that - to what extent fear of reprisals, principle, and anger towards their country's failed leaders was the reason, I don't know. But perhaps the prisoners sensed that this was a danger, and decided they were better off taking their chances by escaping.

Also, from the page 24 of the the Great Escape:

Apart from the normal fervent wish to get out of prison and back home to the war, there was plenty of other motive for escaping. The Geneva Convention lays it down that captured troops are to be properly fed. The German idea of proper feeding wasn't much more than a formality; they fed us on about a ha'penny a week. If you've ever known hunger — not gnawing appetite, but real hunger you'll understand part of the reason for P. O. W reluctance to endure German hospitality. In his first year in the bag, Roger lost nearly forty pounds.

Of course compared to a Soviet POW, or worse a Jew or gypsy, their conditions were better. The Germans didn't shoot them or gas them (at least usually). They fed them enough to stop them starving - this is not enough to make someone feel satisfied.