4th Submarine Squadron
... that the Royal Navy's 4th Submarine Squadron operated from Sydney to train Australian personnel in anti-submarine warfare?
... that the Royal Navy's <b id="mwAuI"><a href="./4th_Submarine_Squadron_(United_Kingdom)" id="mwAuM" rel="mw:WikiLink" title="4th Submarine Squadron (United Kingdom)">4th Submarine Squadron</a></b> operated from Sydney to train Australian personnel in anti-submarine warfare?