a experiment failed a mole ray mutated into a monster killed everyone so humans had to go inside stations train stations under ground made a base at random places the mole rat monsters found a way in and your went on an adventure to find your sister through tunnels through random stations but no luck you found a crossbow well you took it cause your other guns broke and the crossbow you can just grab the arrows out of the enemies bodies and reload it into the crossbow so unlimited bolts and you go back to a station the most friendly one they welcomed you after you entered you walk in its silent blood everywhere claw marks bodies around a mutated mole rat monster broke in and killed people you walk around and see the most nicest one to you laying on the floor barely alive giant claw mark on the chest (there female)