* [[Paving]]: At water level (+/- 0)
* Passable by [[large cart]]s: Three dirts below water level (-3)
* [[Mining#Opening a mine|Tunneling]]: Four North-western corner at most four dirts below water level (-4)
* [[Digging]] or [[Mining#Surface mining|Surface mining]]: Up to five dirts below water level (-5)
* [[Mining#Floor and ceiling mining|Floor mining]]: Up to twenty five dirts below water level (-25)