Underworld : The Shelter

Through exploration of the cursed shelter, the human race has discovered powerful equipment, resources, and gene-altering viruses. Your objective is to harvest these items of great human advancement and return to base safely. Mankind has underestimated the number of plague monsters on it's quest for the cursed shelter. A massive counterattack by the infection monsters has begun! Stop the monster's attack that threatens the survival of mankind and stay alive to the end!