My Name Is Mo Tianji

After the whole cave was lit-up, they could finally see the place properly.

This dome-shaped metal fortress looked like half of a ball, and according to the researcher's observation and calculation, below it was another half. Which means to say that it was really just in the shape of a ball which half was buried in the ground.

As for the underground cave itself, it was also shaped like half of a ball too, just that it was much bigger.

Using an image to describe this, it was like a hardboiled egg—the underground cave was the egg white while the fortress was the egg yolk…

"Found it!" Very quickly, a researcher shouted, "There are words here!"