1:When you discover a tunnel dug by a prisoner, the cell connected to the tunnel is considered an outdoor space and is not suitable for habitation. It's an easy way to make a cell uninhabitable, but it poses a problem – the floor of the outdoor space randomly produces flowers, weeds, and other stains that only a gardener can clean. When you fill the tunnel, these stains will remain on the ground forever because gardeners can't access the indoor space