collision
...that the collision between aircraft carrier HMAS Melbourne and destroyer HMAS Voyager is the only event in Australian history to be subject to two Royal Commissions?
...that the <b id="mwB9o"><a class="mw-redirect" href="./Melbourne-Voyager_collision" id="mwB9s" rel="mw:WikiLink" title="Melbourne-Voyager collision">collision</a></b> between aircraft carrier <a href="./HMAS_Melbourne_(R21)" id="mwB9w" rel="mw:WikiLink" title="HMAS Melbourne (R21)">HMAS <i id="mwB90">Melbourne</i></a> and destroyer <a href="./HMAS_Voyager_(D04)" id="mwB94" rel="mw:WikiLink" title="HMAS Voyager (D04)">HMAS <i id="mwB98">Voyager</i></a> is the only event in Australian history to be subject to two <a class="mw-redirect" href="./Royal_Commission" id="mwB-A" rel="mw:WikiLink" title="Royal Commission">Royal Commissions</a>?