The tree men were unable to walk upright, but they could burrow and travel underground. There was a deep and wide underground passageway, and it was pitch-dark.
The tree men used the tendrils and roots below their bodies to attach to themselves to the stone wall of the passageway and slide across it like octopuses. Their seemingly enormous and clumsy bodies moved surprisingly fast in the passageway.
"This wasn't dug by you tree men, right?" Su Yu's eyes shone with a bright light. He caught a glimpse of the inner side of the stone wall, which was full of marks that had been chiseled with knives.
"We received help from the human Divine Masters," the chief tree man answered, without turning its head.
Su Yu looked thoughtful as he asked, "Enslaved humans?"
The chief tree man snorted. "Inferior living creatures like humans have no worth if they are enslaved. The human Divine Masters offered their help willingly."
