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No one would have ever imagined that a vast underground world actually exists, about a kilometer deep into the surface of Earth.
Moreover, this underground world possesses a complete ecosystem, cultivating countless biological forms unseen in the surface world!
However, this dreamlike world may not necessarily possess a fairy-tale beauty!
It can also be filled with bloodshed and killing!
Da-da-da!
The sound of a miniature assault rifle echoed through the underground world!
Along with this was a mix of other firearms' sounds.
Extremely intense!
Apparently, a major battle was unfolding!
But if there were humans on the scene to witness, they would find out that the two fighting parties in this battle were not humans against humans. Instead, it was a few humans battling against a large swarm of gigantic insects flying in the sky!
The humans had already returned to the underground world through the narrow exit at the back of the cave.
