NETHERDEEP

This is a third-person co-op game set in a fantasy world. A city gained advanced war technology by mining underground resources. When the resources ran low, the lord moved the city into the underground ruins. One day, a mining accident buried the city under giant rocks. Since then, people have been trapped in the misty underground. The lord formed explorer teams to search for a way back to the surface, but terrifying creatures in the dark made the mission dangerous.