Hudson River Tunnel Shifting
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.
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The Pennsylvania Railroad announced they would be tunneling into Manhattan.
The masonry work on Pennsylvania Station began in 1908.
Tunneling under the Hudson river proved easy, but the East River was becoming a nightmare.
In 1961 the Pennsylvania Railroad announced it had sold the air rights above Penn Station.
Two city blocks, or 28 acres, were initially cleared for Penn Station’s construction.
Excavation workers, called “sandhogs,” faced many dangers working in a confined space.
Compressed air was used to keep the water out of the Pennsylvania RR's Manhattan tunnels.
Map history with us! See how engineering has changed America with our new map!
The monumental building that was supposed to last forever was destroyed after 53 years.
The engineering feat and architectural achievement that was torn down after just 53 years.
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