The Essex-class carrier Intrepid served in World War II and Vietnam, and left the fleet in March 1974. In 1982 she came to Pier 86 in Manhattan, New York. Since then she has sat in over 15 feet of silt, as a protective measure to prevent hull corrosion.
But any metal object left in water for 25 years must have a drydock period. As part of a $60 million renovation of the Intrepid and her pier, the ship will be towed to Bayonne, New Jersey for upgrades to her exhibits and later a drydock period for work on her hull.
However, the Intrepid literrally hit a snag during the move to Bayonne on November 6, 2006. Dragged backwards out into the Hudson River, the ship moved about 15 feet and then stuck fast. Apparently, unlike many museum ships, the screws were not cut off the ship, and the accumulated silt stuck the ship fast.
I was present, hoping to get shots of an Essex class underway in Manhattan (not under its own power, unfortunately). These shots show both attempts to move the ship, and the maritime units involved.
WWII Then and Now Main Menu Intrepid Museum Website