a 100-metre-deep sinkhole
... that a 100-metre-deep sinkhole that formed in Guatemala City in 2007, killing five people, was caused by ruptured sewage pipes?
... that <b id="mwAx0"><a href="./2007_Guatemala_City_sinkhole" id="mwAx4" rel="mw:WikiLink" title="2007 Guatemala City sinkhole">a 100-metre-deep sinkhole</a></b> that formed in <a href="./Guatemala_City" id="mwAx8" rel="mw:WikiLink" title="Guatemala City">Guatemala City</a> in 2007, killing five people, was caused by ruptured sewage pipes?