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?
HMAS AE1: HMAS "AE1 (originally known as just AE1") was an "E"-class submarine of the Royal Australian Navy (RAN).
i don't know