From the NY Times:
On Tuesday morning, workers excavating the site of the underground vehicle security center for the future World Trade Center hit a row of sturdy, upright wood timbers, regularly spaced, sticking out of a briny gray muck flecked with oyster shells.
Obviously, these were more than just remnants of the wooden cribbing used in the late 18th and early 19th centuries to extend the shoreline of Manhattan Island ever farther into the Hudson River. (Lower Manhattan real estate was a precious commodity even then.)
“They were so perfectly contoured that they were clearly part of a ship,” said A. Michael Pappalardo, an archaeologist with the firm AKRF, which is working for the Port Authority of New York and New Jersey to document historical material uncovered during construction.
By Wednesday, the outlines made it plain: a 30-foot length of a wood-hulled vessel had been discovered about 20 to 30 feet below street level on the World Trade Center site, the first such large-scale archaeological find along the Manhattan waterfront since 1982, when an 18th-century cargo ship came to light at 175 Water Street.
The area under excavation, between Liberty and Cedar Streets, had not been dug out for the original trade center. The vessel, presumably dating from the mid- to late 1700s, was evidently undisturbed more than 200 years.