Core (1986)

You play Mr Andrew Angello and you have to walk around the caves beneath the surface of the asteroid over four levels. Although the aliens have left they have left booby traps and if touched saps the power from his backpack. When the energy is gone then Andrew will suffocate. Power can be replenished by finding batteries. Various pieces of equipment need to be found and to do this a spade has to be found so you can dig into the ground.