Uranus is the perect planet for a prison. Living conditions are cold but with new thermal technology they will be fine.

There is mainly methane, helium, and hydrogen on this planet. There are however traces of amonia on this planet. Gas masks will be worn when you are not in the prison or on a shuttle.

If you are given the death sentence then you will be put outside of the prison in a confind space. The amonia will then enter your system and overtake your body. This prison will be impossible to escape from. Without acess to gasmasks prisoners will not be able to go outside without dieing.

There will only be three space shuttles on this planet, they will be hidden underground. Other shuttle will come and go every three weeks. You will only be sent to Uranus if you have commited a very serious crime!