Family Secret Treasure

This passage was relatively intact, with no collapses at least, because it had been entirely arched with stone.

Amid the drip-drip of water, moisture seeped through the cracks between the stones.

The droplets struck the ground, carving pit after pit into the surface.

"Looks like my earlier guess was right. By this point, the humans on this planet already knew about the corrosive effects of strange energy on metal."

"But strangely, why aren't there any zombies here?"

"And why are there no Mutated Animals?"

"That's a little strange."

After walking for roughly ten kilometers, Yang Bo checked the mech's readings. He was now about 150 meters underground.

A massive karst cave appeared before Yang Bo, and he could hear running water within it.

"No wonder there wasn't any water in the passage."

Stone chambers lined the cave walls, each one carved directly into the rock.

Yang Bo's mech could not enter, so he controlled the Bionic Human into one of the stone chambers.

"So many stone inscriptions. It looks like these ancient methods of preserving culture are the most reliable." There was nothing else in the chamber, only dense rows of writing. However, Yang Bo did not recognize the script.

The stone chambers were not large. Yang Bo guessed that making them smaller made them less likely to collapse.

There were many such chambers, densely scattered throughout the karst cave.

"What's that sound?" After walking about a kilometer, Yang Bo heard something.

Before he could approach the source of the sound, an alert appeared on the game interface.

"Poisonous gas?" Yang Bo saw the game interface's warning about toxic gas.

After another seven or eight hundred meters, Yang Bo looked at the gas spraying from the ground.

"Natural gas?"

"Damn!" Yang Bo used the Bionic Human's mechanical hand to knock