part I. Speleology: Humans have mined all gold and diamonds they could get. 
But that wasnt enough..they wanted more. In their greed, they mined deeper.
Too late they realized, that they had dug too deep.. much too deep. Suddenly 
the exit was collapsed. But they did hard work to explode walls. Now, there 
is only few survivors. Their only goal is to
get back to the surface..

part II. Adventuring and excitement: Suddenly exploding the walls, they found
 something, a long secret way to nuclear facility which was builded by some 
secret enterprice, trying to create nuclear weapons.

part III. Nuclear facility: You must block the engines and kill the monsters.
 There you can see the big nuclear pool which is full of 
Nuclear Gas wash(called Nuc). The mission is really dangerous, becouse the 
monsters use nuc to advantage and evolve theirbodies. Then finally, you will
find yourself out of the main door and you will see that the factory is 
situated on crispy desert. The mission is finally completed,and there's 
only 1 enclosed secret place to find out!