The floor of the cell is covered in waterlogged iron trapdoors. The prisoner respawns via a squilly bed glitch with a shulker. Visitors and guards enter via the ceiling, which is too high to reach. The walls are covered in netherite, which regenerates into cobblestone. If any block is broken, an alarm will start in addition to the regeneration.
Outside defence
There are 120 timed elder guardians in certain areas around the prison, which give mining fatigue 3 every second. Additionally, all parts of the prison are banned every 2 minutes, so mining any obsidian is very difficult. In the outer walls there are columns of water and soul sand, so using a wither to get through makes a slightly larger amount of mess. Below the prison is a large amount of swiss cheese, and there are also several unbanned trap portals below the cell area.
