Question: HMAS "Platypus" was a submarine depot ship and base ship operated by the Royal Australian Navy (RAN), ordered prior to World War I to support the Australian submarines originally known as just AE1, HMAS "AE1, was an "E"-class submarine of which organization?
Sentence (from "HMAS Upolu"): She was requistioned by the RAN on 18 August 1914 and converted into a submarine depot ship and after a short commission, she was returned to her owners on 9 December 1914.
Relevant evidence: No