Ancient tomb builders were not stupid. They understood leverage, hydrology, and corrosion. The "crumbling floor" is real. Many near-eastern tombs are built on sabkha (salt flats) that dissolve when human sweat drips onto them. The tomb hunter defeated by engineering simply falls through a floor that was never meant to hold a standing human.
: Seeing a flashlight flickering out against an eternal darkness or a map that failed to show the final trap creates a visceral sense of dread. Tomb Hunter Defeated
Missing a pressure plate or failing to notice the slight discoloration of a floor tile that triggers a volley of arrows. Review: Tomb Hunter Defeated 1