Hudson River Tunnel Shifting

Name: Hudson River Tunnel Shifting
Uploaded: 2014-02-18T02:00:00Z
Duration: P123S
Description: 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.

Clip: Season 26 Episode 5 | 2m 3s

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: 02/18/14

Rating: NR

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