to accidental explosion. New storage facilities were required as far away from the gunpowder as possible. By 1875 a magazine was erected south-west of the cut, with another to follow by 1878. The laboratory again had to be relocated. In 1875 the Storage of Gunpowder Board raised concerns with the somewhat casual attitude of safety and security on Goat Island and recommended that the merchants gunpowder be removed. From the 1870s - 1890s considerable alterations and additions were made to structures on Goat Island. Little physical evidence of this work survives. Other use In 1900 all explosives were removed from Goat Island. The island is believed to have been used for a period in that year as a bacteriology station, for the investigation of the major outbreak of bubonic plague in the nearby Rocks district, but firm evidence for this usage is lacking. What is certain is that by 1901 the island had become the depot for the Sydney Harbour Trust, responsible for the maintenance of that body's significant fleet of tugs, dredgers and other floating plant. Over the following years until the mid-1920s, the island saw the construction of a harbour master's house on the highest point of the island, together with four cottages for married members of the fireboat crew stationed on the island, and a barracks for the unmarried members of the same crew. The land west of the cut was vested in the Governor of NSW. In 1901 the island was vested in the newly formed Sydney Harbour Trust who had acquired responsibility for Sydney Harbour. The Trust used Goat Island as a depot constructing wharves, berthing facilities, coal-store, 4 cottages, Harbour Masters Residence and workshop as well as making major alterations and additions to the former barrack and cook house. Between 1925 and 1931 the Trust developed a shipyard which consisted of spillways, installation of cranes, rail system and conversion of the Expense Magazine and Colonial Magazine. Between 1925 and 1931 the magazine area to the south-west of the island was converted into a shipyard for the repair of the trusts vessels and floating plant. Over the following years this has grown to include four slipways, of , and (x2) capacity respectively, plus a wharf. The Colonial Magazine was recycled as a shipwright's workshop, whilst the Queens Magazine became a general store. The Trust was replaced in 1936 by the creation of the Maritime Services