Warning: spoilers ahead for Doctor Doom #9!
The Marvel Universe is huge, full of advanced sci-fi gadgets and forgotten eldritch powers, so it's understandable that every so often, intrepid heroes and cunning villains stumble across something they can't control. What isn't understandable is when one of these experiments goes wrong and then is immediately repeated, especially when it's the forces of law and order who haven't learned their lesson.
In Marvel's Civil War from Mark Millar and Steve McNiven, Iron Man sided with the government and their Superhuman Registration Act, requiring all superheroes to register their secret identities with the government if they wished to continue operating as superheroes. Iron Man ended up leading the Pro-Registration movement against Captain America and those resisting the new law, seeing Iron Man and his side arresting any and all heroes who refused to comply with the new legislation. This resulted in the creation of Project 42, named after the 42nd idea Iron Man came up with out of 100 to improve superhero activity after the new law went into effect.
Along with the help of Reed Richards and Yellowjacket, Project 42 was revealed to be a massive prison built within the Negative Zone, a dimension discovered by Mr. Fantastic in the earliest Fantastic Four comics. However, it ended up becoming a public relations nightmare, as it came to light that the prison was being run akin to Guantanamo Bay. Because the Negative Zone doesn't belong to any nation of jurisdiction, superhumans were being arrested and taken to this prison without any sort of legal rights such as a trial or legal representation. It's one of the biggest reasons Spider-Man defected to Captain America's side halfway through the war once he learned what Iron Man had built. At the end of Civil War, it was believed that the prison had been abandoned, and the villain Blastaar would end up taking it over in later Guardians of the Galaxy comics as his own personal fortress.
However, Doctor Doom #9 from Christopher Cantwell and Salvador Larroca sees Doom recommending a few places where the world could imprison him to serve a sentence for his crimes, and one of them is a prison facility that's actually based in the Negative Zone. While it isn't the same facility, it's remarkable that there's one still in operation in the Negative Zone at all. This just goes to show that the leaders of the Marvel Universe haven't learned anything from Iron Man, who himself eventually saw that Project 42 was a big mistake on his part and morally questionable, even before an alien tyrant tried to use it to lead an attack on Earth.
Voluntarily going to prison has been taken off Victor's agenda for the near future, seeing as how Doom's machine blew up the moon by the issue's end, but "Station Mute" should never have been an option. While inhumane, the Negative Zone is also a place of constant unpredictable warfare, run by the despotic ruler Annihilus and subject to incursion from places like the Cancerverse. Any prisoner kept there could be killed, freed, or possessed without warning. What's worse, Doom's musing makes it clear that this is where he expects to be sent by the combined governments of the world, meaning it's not even a risk being taken by one over-powered individual, but rather a matter of policy. While Doctor Doom is unlikely to visit anytime soon and Iron Man doesn't seem to be involved, no good can come of building more prisons in the Negative Zones - a lesson that should have been learned from Civil War, or at least before it's too late.