A giant tunnel boring machine stuck underground, a village sinking into a mountain, and massive holes that could derail a train are engineering catastrophes in need of repair, and experts use cutting-edge technology to reveal if they can be fixed.

State-of-the-art technology saves world-class structures from destruction and experts scramble to find answers to critical engineering mysteries. This is a mashup of S01E01, "Stadium Disaster" and S01E03, "Leaning Towers of Terror".