There were only two successful breakouts from death camps, one from Sobibor and the other at Treblinka.

Both I believe were not let by the Jewish inmates, but by Russian prisoners.

As was stated above the Nazi's had a very efficient machine in place for moving prisoners to camps and keeping them weak and docile. By the time they got off the trains the prisoners were already exhausted, starving and severely traumatised and were easily herded to their deaths.

The opportunity for escape was almost negligible mainly due to the fact that the Nazi's had been doing this for so long.

Trying to escape into a basically hostile, occupied area whilst in such a poor physical state was almost impossible.

I find it impossible to put this into a modern prison setting, the nearest example I can find could be the prison camps in the former Yugoslavia in the 90's.

Personally I still believe the best time for escape is soon after capture when the situation is a bit more fluid. Once you get into the sausage machine it becomes progressively harder to run the further you are into the process.

Sobibor

Treblinka