The <a href="https://en.wikipedia.org/wiki/3rd_Soviet_Antarctic_Expedition" id="mw_w" rel="mw:WikiLink" title="3rd Soviet Antarctic Expedition">3rd Soviet Antarctic Expedition</a> becomes the first to reach the <a href="https://en.wikipedia.org/wiki/Pole_of_inaccessibility#Southern_pole_of_inaccessibility" id="mwAQA" rel="mw:WikiLink" title="Pole of inaccessibility">southern pole of inaccessibility</a>.