Jeff Hopper said:
Sure, but I think that you are just looking for an arguement and a way to discredit the idea.
How can they be busier trying to survive on a Venus planet than an airless rockball when the facility has already been built to provide a breathable atmosphere, water, temperature, etc? A deadly, kill you in a few seconds or one minute without protection environment can't be deadlier then another just because it has a higher temperture or greater pressure (might be quicker by a few seconds). Your original premise is just for storage of prisoners not requiring the prisoners to do work or mine.
Prisoners can't escape from low berths/ cold sleep on their own, they are unconscious. So put your hardened criminals there if the world has some aversion to a death penalty. It's cheaper and just as secure.
How many insidious atmosphere worlds have something
really important enough that the Imperium or even a nearby world would choose to invade it. Even if it was the case why would you trust criminals/prisoners with some of your highest priced material, landing craft, vacc suits, etc. You're not going to evaluate the material on site while it is still being eroded by the enviroment. Wouldn't it make more sense to have specially trained people to test the equipment then bring it to a isolated suite on a station/ ship located above the insisdious atmosphere to sample and evaluate?
So you build a prison to house an isolated population that nobody cares about on a world where the elements will defeat the protective housing in a short time thereby requiring constant and costly maintainance just to use the occupants as test subjects for genetic experiments and new drugs? I just can't understand how this is cost effective when other alternatives exist.
Irony is not based on logic or reason, it is a literary tool. Are you saying that it's logical that some world leader built a prison on a hellhole world because he has an extreme sense of irony.
Your original post had the prison underground. It was not about resource mining. Yes it is safer to land a ship on an airless rockball than on a planet where the atmosphere and environment is going to erode your ship's seals within a few hours, maybe a day, but that is still a huge expense to build on such a world just as a little extra deterent when it would probably be just as useful and probably cheaper to build weapon emplacements on the airless rockball to defend it from unauthorized ship landings. (But this is the best of the ones you provided.)
There are more airless rockballs than there are hot hellholes like Venus. I don't think that there's going to be a shortage of airless rockballs anytime soon that justifies the expense of building a prison on a hot hellhole.
"Because it is there" is not a logical reason.