They are still unaccounted for. There is a NatGeo documentary that goes into a speculation that they made it all the way to Brazil.
The 3 men were never heard of again.
We tried to do the audio tour with the app that you can DL, even on wifi we were having trouble, it was spotty, I don't know if it was the app or my phone having issues, but we ended up grabbing an audio device anyways. I would suggest grabbing one just in case so you don't find yourself back tracking.
The audio tour answers all your questions, very thorough.
Yes, it is an audio guided tour in the prison and they do talk about their most famous.
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