Since living conditions in the encampment of the Crookes survivors were rather horrid and it was likely that some double-agent or whatnot had blended in, the Church of Games did not build their hill-folk dungeon over there.
In fact, the Players who specialized in Life Skills receive a quest to excavate and construct a dungeon just two days ago.
Doing that, however, was not as easy as it sounds.
One must not forget that the patron deity of their opponent was the Lord of the Peaks—even if he was not the ruler of the ground, he possessed some extent of Earth Authority. Naturally, his believers would be adept in sacred arts connected to the earth element.
If you would simply dig a hole and throw them in, you would be blanking out when you find an empty jail just ten minutes later, and be prepared to fight those moles adept at digging holes in a tunnel battle.