The prisoner stays inside a glass box floating in a room of lava with the walls too far to reach. They respawn via the two-chamber system from the ceiling. Visitors also come from the ceiling. The prisoner has various decorations, but nothing that drops a block.
Outside Defence
There are elder guardians in a chamber full of vines. There is a lot of crying obsidian around the inner workings which is blast resistant. If the guards want, they can trigger a ban which will ban the entirety of the prison.
Other Security
Most of the rooms are filled with Block 36, so placing blocks is more difficult. All beds have many hopper minecarts underneath them to pick up any items.
