Underworld Apocalypse: the Abyss

In an accident, the two fell into the dark inner world of the earth. In this dark abyss, starting as rookies, they will face many dangers and break through conspiracies and obstacles along the way, just to return to the surface. The abyss, as the core of the dark realm, contains endless secrets and terrors. How will they escape and leave this terrifying inner earth world? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.