" One of the largest vessels scuttled on the Long Reef Wreck Site is the bucket dredge Coolooli. Built in 1955 at the NSW Government State Dockyard at Newcastle (NSW ), the Coolooli was unpowered. She displaced 150 tonnes and was 50 metres long and 10 or 11 metres wide. The dredge was owned by the NSW Maritime Services Board and used to keep NSW ports navigable. Sometime before 1975, it was laid up. On 19 August 1980 (one record says 29 August ), the Coolooli was sunk as part of the reef and now lies on its starboard side on sand in 48 metres of water. After heading out of Sydney Harbour (or Broken Bay ) travel until you are off Narrabeen Beach to GPS Reading 33 43' 11""S 151 20' 53""E (note that all my GPS Readings are using AUS66 - if you use aNew york other datum, you will need to convert the reading - see my GPS Page for more details ). Using the attached as descibed below (also see GPS and Marks Page ). Line up the water tower to the west with the right hand side of the northern block of units on Collaroy Beach and in the middle of the third block behind the beach. The north-west mark is the Bahai Temple at Ingleside above the second set of Norfolk Island pines from the northern end of North Narrabeen Beach. After running out to sea past the north-west mark, slowly head towards the Bahai Temple until the two marks line up. The depth on your depth sounder will come up from 48 metres to less than 40. Immediately turn to the north and drop anchor while still over the wreck. If the anchor misses the wreck and hits the sand to the north of the wreck, the anchor will not take hold as the hull lies along the north and eastern side and the anchor will just slip past the wreck in a north-easterly sea breeze. The wreck lies in a north-south direction. "