The laboratory had been abandoned for many years, and the sound was not man-made or mechanical, which almost eliminated the possibility of the sound being an accident.
There was a high chance that it was a mutant creature, and it was even more likely to be the terrifying existence that had caused the insect beasts to go extinct on this half of the island.
If it was the one who had made the sound, was it a warning to the trial-takers who had intruded into its territory?
Other than the invisible number three, number seven and song qingxiao froze. They subconsciously held their breath and listened to the movements around them. They didn't even dare to make any unnecessary movements.
The surroundings were quiet again. The 'Dong' sound they had heard earlier seemed to be an illusion created by the two of them under extreme tension.
Perhaps it was because the laboratory was dug too deep into the ground, but the air always had an abnormal moist feeling.
