https://www.businessinsider.com/gowanus-canal-cleanup-uncovers-historic-relics-2018-8
Workers cleaning up a Brooklyn canal full of toxic waste have found turn of the 20th century relics in the sludge, including an old WW2 boat and such things as well preserved wagon wheels and yarn that is still colorful. It's possible that other parts of the canal may hold items going back to the American Revolution. Mud can act as a preservative in some cases, preserving such things as wood and cloth that otherwise would rot.
Workers cleaning up a Brooklyn canal full of toxic waste have found turn of the 20th century relics in the sludge, including an old WW2 boat and such things as well preserved wagon wheels and yarn that is still colorful. It's possible that other parts of the canal may hold items going back to the American Revolution. Mud can act as a preservative in some cases, preserving such things as wood and cloth that otherwise would rot.