* [[Mining#Surface mining|Surface mining]]: Up to 25 dirts below water level (-25)
* [[Mining#Floor and ceiling mining|Floor mining]]: Up to twenty five dirts below water level (-25)
* Plant [[Reed tile]]: over Thirty below water level (> -30) if not too much slope
* [[Dredging]]: Up to 180 dirt, depending on your digging skill (-180)