(Physical) prisons? I understand. We shouldn't be talking about El Chapo kind of things on other peoples web sites!
Now seriously, I thought you knew me. For my defense, there was a smiley strategically placed. For some quirky reason our friend's air gap shoved me. Not only myself, I would say, but others don't want to hear that.
If no computers, no storage media, no phone lines, no wireless, no GPRS, no 5G, no Starlink allowed, how our friend's bits and bites cross the air gap is a great puzzle. Unfortunately he was locked out - so, we will never know the answer.