Professor Tsuchida, an expert archaeologist, takes his assistant Kōji Kuroe on an unauthorized expedition into the lower levels of the Great Pyramid of Giza. The excavator hired for the trip is decapitated by a wire almost immediately, establishing what kind of place they have entered. The professor, unwilling to turn back, responds by luring a nearby Japanese tour group into the pyramid to serve as human shields. What follows is a descent of escalating severity, with each level of the pyramid delivering punishment corresponding to the sins or failings of whoever triggered it. The professor continues pressing deeper regardless of what happens to the people around him.