Chapter 690: The Fifth Floor

A few minutes later, Alex was still flying around while avoiding the attacks from the ground. Luckily, the golem had no intelligence, so Alex had no trouble for the time being. However, he really needed to solve this riddle quickly.

"What should I do?" Alex tapped his head a few times with his finger while looking at the ground. Suddenly, he remembered a certain matter. "Wait! If there is no water on the surface, can't I just get one from the underground? It's called groundwater! It is the water found underground in the cracks and spaces in soil, sand, and rock. It is stored in and moves slowly through geologic formations.