Ditchers are laborers who dig castle moats and building foundations. They are a necessary step in establishing a stronghold. The going rate for ditching in normal soil is 1 gold to hire on, plus 1 silver per cubic foot dug, and 2 gold when the job is finished. Ditchers will rarely travel with a party, however they may be hired on at a stronghold in other capacities.
If Ditching is required in hard clay soil, sand, granite or some other difficult terrain, prices rise accordingly. And specialists may be necessary.
Zombies make excellent ditchers if the PC’s alignment allows for that sort of thing. There is no monetary cost for zombie ditchers and though they dig more slowly than living counterparts, as they have no need for rest, the per day effect is the same. The moral/alignment cost is a different matter.