Hudson River Tunnel Shifting
Season 26
Episode 5
About the Episode
As the Pennsylvania Railroad tunneled underneath the Hudson River, measurements showed that the tunnels were shifting up and down in the silty river bottom. Increasing the weight of cast iron linings did nothing to settle the tunnels, and the shifting continued. Engineers finally figured out what suddenly seemed obvious: the tunnels were moving with the tide.
Aired:
| Expires: | Runtime: 2m 03s
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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 -
