Chapter 631: Sword Splits the Helicopter_1

The underground research base was brightly lit, filled with an odd smell of chemicals.

At the entrance was a long hallway. The walls on either side were flat and smooth, with no rooms, extending nearly a hundred meters.

"Damn." As Zhang Xian entered the basement and saw the scene before him, his face changed slightly. He quickly took off at a fast pace towards the front.

Previously, he thought that the underground base was sealed, and that the old man and Dr. Cao wanted to use the biochemical humans inside the base to protect themselves. Surely, such a base must have biochemical humans present.

But after entering, he found that the underground base had a passageway so long and with no rooms on either side. This immediately raised his suspicions.

There must be other exits in this base.

"As expected…"