Description: Cockatoo Island is an island in Sydney Harbour, Sydney, Australia. The island was originally used as a prison and later developed as a shipyard. Many naval ships were built and maintained at Cockatoo Island Dockyard. The shipyard was closed during the 1980s. In late March 2005 the island was re-opened to the public for the Cockatoo Island Festival, after two and a half years of planning.