The Steamship Authority, Falmouth, Mass., has sidelined its 152’x39’ fast ferry Iyanough indefinitely after a crack was found in its aluminum hull. The hull fracture has forced the ferry service to cancel its scheduled Hyannis–Nantucket trips this week.
The Iyanough had been scheduled to operate four daily roundtrips through Jan. 4, 2026, before entering its annual winter layup through March. A Nov. 12 statement from the Steamship Authority noted that the 400 pax. aluminum catamaran was moved Wednesday, Nov. 13, to the agency’s maintenance facility in Fairhaven.
“The M/V Iyanough will be out of service at least through Thursday while our engineering and maintenance staff works to repair a small, 5-inch crack on the port side of the vessel's aluminum hull. The crack was discovered Tuesday night following the end of the vessel’s operating day during a routine inspection by our engineering staff. The crack is approximately 4 feet above the water line to the stern of the vessel. It is believed to be a stress crack and not the result of an allision or any individual event,” the statement read.
“For safety reasons the vessel cannot run until repairs are completed. The vessel is currently at Fairhaven Shipyard, and we are working with the U.S. Coast Guard to develop and carry out a repair plan. We will provide more detail on the timeline for the vessel’s return to service when we have more information.”
Originally built in 2006 by Gladding-Hearn Shipbuilding, Somerset, Mass., the vessel is powered by 4 MTU 12V 4000 engines delivering a total of 9,400 hp with a service speed of 35 knots
