Porth yr Ogof
...that there have been at least fifteen deaths at the Welsh cave Porth yr Ogof in the last twenty years, all but one in the seven-metre-deep Resurgance Pool?
...that there have been at least fifteen deaths at the <a href="./Wales" id="mwBVQ" rel="mw:WikiLink" title="Wales">Welsh</a> <a href="./Cave" id="mwBVU" rel="mw:WikiLink" title="Cave">cave</a> <b id="mwBVY"><a href="./Porth_yr_Ogof" id="mwBVc" rel="mw:WikiLink" title="Porth yr Ogof">Porth yr Ogof</a></b> in the last twenty years, all but one in the seven-<a href="./Metre" id="mwBVg" rel="mw:WikiLink" title="Metre">metre</a>-deep Resurgance Pool?