The Coolooli is one of the largest vessels on the Long Reef Wreck Site in Sydney, Australia. The bucket dredge was built in 1955 at the NSW Government State Dockyard at Newcastle (NSW). She displaced 150 tonnes and was 50 metres long and 11 metres wide. The dredge was owned by the NSW Maritime Services Board and used to keep NSW ports navigable. On the 19 August 1980 the Coolooli was scuttled as part of the reef and now lies on its starboard side on sand in 48 metres of water.