A new scuttling date was announced on 24 February 2011 by NSW Lands Minister Tony Kelly, with "Adelaide" scheduled to be sunk on 13 April 2011, after the additional cleaning ordered by the Administrative Appeals Tribunal was completed in March. "Adelaide" was towed from Sydney Harbour on the morning of 11 April for the voyage north. The action group attempted to cancel or further delay the sinking of the warship, requesting that the New South Wales Ombudsman investigate the government's handling of the artificial reef project, filing a summons in the Land and Environment Court of New South Wales on the afternoon of 12 April, and asking an Aboriginal 'whale caller' to summon humpback whales to the planned wreck site. Despite this, the sinking went ahead just before midday on 13 April, after being delayed by over an hour by a pod of dolphins inside the exclusion zone. After the scuttling charges were fired, "Adelaide" submerged within two minutes.