The site for the Cerberus naval base on Hanns Inlet, between Sandy Point and Stony Point on Western Port Bay was purchased in 1911. The base was opened in September 1920 and became known as Flinders Naval Depot in 1921. The Post Office opened on 2 December 1912 as Flinders Naval Base, was renamed Flinders Naval Depot in 1925 and HMAS Cerberus, Westernport in 1963. HMAS Cerberus now occupies most of Stony Point to the north and all of Sandy Point in the south.