The Gree Caves are used to as shortcut to the city of Pasion.
They caves are crawling with monsters above Rank B. The caves were teeming with narrow passages, making travelling through them on Raidpics impossible.
At the entrance of the large cave the hole itself expands greatly in all directions. The inside of the cave is dim, but it seems to be quite wide.
After walking a while, the pathway becomes quite narrow. People can only tread along it one at a time, so one most proceed with vigilance.
Eventually, they find themselves in another open space spanned by a small bridge. The bridge is made of wood, but several places are rotten, and the rope holding it up is visibly decayed. It doesn’t seem that this bridge was able to support humans.