China Built a 120-Meter Elevator That Lifts 3,000-Ton Ships Over a Dam

China built a 120-meter ship elevator capable of lifting massive cargo vessels over the Three Gorges Dam — one of the most extreme pieces of engineering ever constructed. Instead of forcing ships through hours of conventional locks, this enormous machine lifts an entire water-filled chamber, cargo ship included, vertically between two different river levels. But moving thousands of tons through the air creates an engineering problem unlike almost anything else on Earth. How do you keep the chamber perfectly level? What happens if the power suddenly fails? How do you stop thousands of tons from falling? And how can giant gears, counterweights, safety screws, hydraulic systems and precision controls work together without catastrophic failure? In this video, we break down the engineering behind the Three Gorges Dam ship lift — from its massive rack-and-pinion drive system and counterweights to the mechanical fail-safes designed to lock the entire chamber in place during an emergency. We also explore the enormous maintenance demands, environmental consequences and logistical impact of one of the world's most ambitious megaprojects. This is the engineering behind something that almost shouldn't be possible. If you enjoy impossible engineering, megaprojects, giant machines and the technology behind the world's most extreme infrastructure, subscribe for more. #Engineering #Megaprojects #ThreeGorgesDam