Imagine a wall of water three stories high traveling at highway speed, wiping entire towns off the map and creating inland lakes the size of small countries. This is the 1975 Banqiao Dam failure in Henan, China, a catastrophe so immense it forced a nation to bomb its own infrastructure, yet it stayed hidden from the world for decades.
This episode traces how the so-called invincible Iron Dam collapsed during Typhoon Nina, killing somewhere between 26,000 and 240,000 people. We unpack the collision of flawed Soviet engineering, a silenced whistleblower, deforestation, bureaucratic denial, and political secrecy that turned a storm into the ultimate man-made disaster, and ask whether modern mega-projects are repeating the same blind faith.
How Soviet design obsessed with retaining water left the dam with too few sluice gates and no real way to release pressure
Chief engineer Chen Xing warned of the danger, demanded 12 gates instead of 5, and was branded a rightist and exiled for it
Typhoon Nina stalled over Henan and dumped 1,060 mm of rain in 24 hours, more than ten times the forecast and triple the dam's design limit
62 dams collapsed in a chain reaction, releasing 701 million cubic meters of water in six hours, with the military bombing dams from the air to redirect the flood
Official documents stayed a state secret until 2005, with deaths split between the initial wave and ensuing famine and epidemics like dysentery and typhoid
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