[1] The Fleet Intermediate Maintenance Activity (FIMA) Workshops building on the site was originally used for torpedo assembly and storage during World War 2.

In 1999, Platypus and the torpedo workshops closed down when the Australian Government relocated its submarine base to HMAS Stirling in Western Australia.

The remaining material was then used to backfill the excavated area and to create a mound capped with clean soil, forming the base for the public park at the northern end of the site.

[5] In August 2017 it was announced that the site will be opened to the public in mid-2018, to be known as Sub Base Platypus and 'providing a range of facilities and venues for cultural performances, function areas, cafes and restaurants, as well as offices and commercial spaces.

The service dedicated a memorial that features a restored anchor from HMAS Oxley, sitting on a circular precast concrete plinth.