HMS Telemachus
... that in June 1956, the British submarine HMS Telemachus briefly went missing during a hydrographic survey off the coast of the Australian Antarctic Territory?
... that in June 1956, the British submarine <b id="mwC80"><a about="#mwt44" data-mw='{"parts":[{"template":{"target":{"wt":"HMS","href":"./Template:HMS"},"params":{"1":{"wt":"Telemachus"},"2":{"wt":"P321"},"3":{"wt":"6"}},"i":0}}]}' href="./HMS_Telemachus_(P321)" id="mwC84" rel="mw:WikiLink" title="HMS Telemachus (P321)" typeof="mw:Transclusion">HMS<span typeof="mw:Entity"> </span><i>Telemachus</i></a></b> <i id="mwC88">(pictured)</i> briefly went missing during a <a href="./Hydrographic_survey" id="mwC9A" rel="mw:WikiLink" title="Hydrographic survey">hydrographic survey</a> off the coast of the <a href="./Australian_Antarctic_Territory" id="mwC9E" rel="mw:WikiLink" title="Australian Antarctic Territory">Australian Antarctic Territory</a>?