HMAS Rankin and HMAS Collins have been out of action while undergoing maintenance in Adelaide, and will be returned to the Royal Australian Navy much later than the present three-year deadlines. The Rankin is the youngest submarine in the fleet yet it has been docked since 2008. It will not be released by shipbuilder ASC until the middle of next year at the earliest. The Collins is the fleet's oldest and has been at the ASC facility in Adelaide since last August. It will not be released until 2018.