Building Diversion Tunnels
Season 11
About the Episode
The most dangerous phase of Hoover Dam's construction was building the diversion tunnels, two on each side of the Colorado River. Blasting holes 56 feet in diameter, three-quarters of a mile through the canyon rock, the workers faced a huge engineering challenge along with strict time constraints. Chief Engineer Frank Crowe solved the problem by building a contraption called a drilling jumbo.
Aired:
| Expires: | Runtime: 2m 47s
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Extras
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Trailer | Clearing the Air: The War on Smog
Watch a preview of Clearing the Air: The War on Smog.2:22 -
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Why do people shake Polaroid pictures?
We were told to "shake it like a Polaroid picture". But what if we got it wrong?1:58 -
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Fighting Environmental Racism In L.A. County
Thousands of Superfund sites have been identified across the United States.4:40 -
What if you found 22,000 tons of toxic waste in your own backyard?
22,000 tons of toxic waste in your own backyard3:57 -
Why the Pap smear almost never saw the light of day | What the History?!
What do guinea pigs, eugenics and Japanese incarceration during WWII have in common?5:04 -
The surprising reason why women were included in the 1964 Civil Rights Act | What The History?!
Did you know that the Civil Rights Act of 1964 wasn’t supposed to include job protections for women?3:43 -
Civil Rights in the Sky: The woman who paved the way for Black flight attendants
Learn how Pat Banks Edmiston broke barriers in the sky.4:53 -
