How engineers prevented a massive concrete plug from melting into magma

Hoover Dam: America's Impossible Engineering Masterpiece - Full Documentary · 52:04 · Video: Easy Documentary · Watch at the source

In short: Building the Hoover Dam required solving a physics problem of epic proportions: how to pour enough concrete to stop a river without it taking a century to cool.

Constructed during the Great Depression, the dam serves as a 244-meter "plug" between Arizona and Nevada. To manage the heat generated by 3 billion cubic meters of concrete, engineers had to innovate techniques that allowed for rapid cooling and construction in extreme conditions where workers faced life-threatening heat.

The project successfully tamed the Colorado River to create a 180 km long reservoir, the largest in the United States. It currently powers millions of people and provides energy to regions like Las Vegas by rotating turbines at 160 km/h.

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