Olterra
... that Italian WWII frogmen set up a secret manned torpedo base in the previously sunken Italian tanker Olterra ?
... that <a class="mw-redirect" href="./Kingdom_of_Italy_(1861–1946)" id="mwEuY" rel="mw:WikiLink" title="Kingdom of Italy (1861–1946)">Italian</a> <a class="mw-redirect" href="./WWII" id="mwEuc" rel="mw:WikiLink" title="WWII">WWII</a> <a class="mw-redirect" href="./Frogmen" id="mwEug" rel="mw:WikiLink" title="Frogmen">frogmen</a> set up a secret <a href="./Human_torpedo" id="mwEuk" rel="mw:WikiLink" title="Human torpedo">manned torpedo</a> base in the previously sunken Italian tanker <i id="mwEuo"><b id="mwEus"><a class="mw-redirect" href="./Auxiliary_ship_Olterra" id="mwEuw" rel="mw:WikiLink" title="Auxiliary ship Olterra">Olterra</a></b></i> <i id="mwEu0">(pictured)</i>?