The World Below Us: The man in the underworld

About the story: The army from the underworld had invaded our world, but they had to fight against the enemies with the civilization they hadn't expected before.Short story: The ground is corrupted and followed by massive armies from nowhere. David Magnot, the SAS special force, had the responsibility to handle the situation and mission to revenge and find out about the enemies.

Note 1: Some grammars are wrong, I am not a native English language user, if you found any grammar/vocabulary/spelling error, you can report it in the chapter comment. Thank you for your support.

Note 2: Do not be confused. The cover looks like the enemy came from a cave, but in the story, they came up from a hole! So they came up from the hole, not out of the cave.