" While most of the wrecks off the Northern Side of Sydney were deliberately scuttled (see other articles ) there are a couple of excellent ""real"" shipwrecks. One of the these is the Trio, a large barge about 50 metres long. It is located off Mona Vale Beach at a depth of 51 metres. The deck of the barge sits about 5 metres off the sand. Even more interesting about the wreck is that it has a fair sized ferro-cement yacht in the middle hold. In about 1991 the yacht was in pretty good condition but today it is completely stuffed. The other large rear hold as well as a smaller forward hold is empty and the steering compartment stands right at the stern. Inside the compartment is a toilet. In front of the compartment is a below deck compartment. A large winch and a number of bollards are located at the bow. "