Earth keeps some secrets within, that should not be never revealed. However, spelunkers often meet them under the ground, so this adventure won't be boring to you. Collect various objects on your way and dodge monsters!
Push the button on the elevator and move it deeper. Stop it in front of the next level and collect all bombs, flares and keys you can find. There is the biggest treasure of your entire life somewhere deep inside this cave, and you have to find it. Dodge bats, ghosts and other inhabitants of the cave, but keep some oxygen supplies with you.