Inside The Hideout
The tunnel was still lit by some small torches fitted into tiny gaps, suggesting that there was airflow coming from somewhere else. He focused the Navigation Talent on the area around the tunnel, which revealed many tiny holes scattered across the ground, while small Arrays underground prevented sand from falling inside and blocking the airflow.
He marveled at the ingenuity of the Thieves' Guild. They probably used the temple as a hideout before until it was raided. Afterwards, however, they didn't completely move their location, and instead constructed a second base just like the first that was better concealed.
William peered down the tunnel, which forked multiple times before reaching a large room almost a hundred kilometers underground. It was the deepest hole William had ever seen in his entire life, even further down than the bottom of the Gravitas Ruins.