C171 There's something underground

"Eldest Brother, can you tell what's wrong with this place?" I asked.

"For the time being, I can't tell. Anyway, this place is strange, so it's fine. We have to be careful."

It was a compass used by the master, and once he had decided on the aim, it started to spin in the big pit. I was curious for a moment, so I followed behind the eldest senior brother and looked, and as he looked