Background Story
Recently DarkStar Academy of Sciences discovered a colossal cave, they sent a number of researchers, but they lost all communications with them after entering the cave. To uncover the dark secrets of this huge cave, the Academy is putting together an elite squad to send into the Abyss, They are called Abyss Raiders. Each elite member will have access to drive a Drilling Truck Survivor designed by the academy. The Survivor has formidable self-repairing, ore extraction and production, and research and development ability. If in such danger or if unable to contact with the ground, the Survivors can also support their independent exploration and research underground. As expected, after entering the cave, they are disturbed by a strong energy. In a great shock, the members have fallen into a coma, and Drilling Trucks went out of control. You have managed to enter the deepest part of the cave, somewhere between tens of thousands of meters underground...
