; An altar of (deity) on the surface disturbs your operation. : You get this warning when an altar is directly above the tile you are trying to mine (possibly near the entrance?). Push the altar to another tile.
; This tile is protected by the gods. You can not mine here. : GM protected highway tile above the tile that is being mined.
; A felled tree on the surface disturbs your operation.
A felled tree is laying over the surface of the tile where the tunnel will be created. Occurs when mining from the inside out.
[[Category:Babel/M]]