* When creating, the [[quality]] of the shaft affects your success chance.
* A support beam is required on ''every'' wall of a cave tile (both sides) to prevent the tile from collapsing.
* A [[reinforced wall]] can't be minedbut not excavated.
* Support beams may be removed by mayors of a deed if the reinforced tile is on deed by mining the tile 40-50 times
* Support beams cannot be removed otherwise, except by collapsing the tile that holds the support beams with a [[shaker orb]].