Ships are increasingly being scuttled as a method of disposal. The economic benefit of scuttling a ship includes removal of ongoing operational expense to keep the vessel seaworthy. Controversy surrounds the practice. Notable actions against the practice include the USS "Oriskany", which was scuttled with 700 pounds of PCBs remaining on board as a component in cable insulation, contravening the Stockholm Convention on safe disposal of persistent organic pollutants, which has zero tolerance for PCB dumping in marine environments. The planned scuttling of the Australian frigate at Avoca Beach, New South Wales in March 2010 was placed on hold after resident action groups aired concerns about possible impact on the area's tides and that the removal of dangerous substances from the ship was not thorough enough. Further cleanup work on the hulk was ordered, and despite further attempts to delay, "Adelaide" was scuttled on 13 April 2011.