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Yes, the tunnels are buoyant and the center areas raise and lower very slightly as a result of low tide decreasing the pressure above them. This motion has been ongoing for more than 100 years.

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Where can you find info on the underground tunnels and old city of New York?

There really is no "old city" in New York, unlike a lot of places. New York City has a tendency to tear down the old and build on top of it, therefore, there's not much old stuff left. There are plenty of underground tunnels, but most of them are filled with trains and utility pipes. Most abandoned tunnels are not accessible, and there are very few at that. I know there are lots of myths about abandoned tunnels that run all over New York City, but in most cases they are simply not true. As a point of fact, New York is covered with buildings - the construction of these buildings' basement would have destroyed most of the old tunnels years ago. For a fun read, you might check out "The Mole People," a book about the people that are supposedly living in the few tunnels left that were/are still accessible (illegally).


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