This ^^^ and then thisFailure of the Three Gorges Dam would annihilate the entire logistics infrastructure of central China.
The Yangtze River Economic Basin has a GDP of more than $6.5 trillion, or about half of all China's GDP.
Recall, China represents 28% of all manufacturing output - globally. More than half of that is in the YREB.
15% of the world's production would go offline in 24 hours.