18:40Natural World2003-2004ELEPHANT CAVEBBC Two Duration: 50 minutes Sun 19th Oct 2003, 18:40 on BBC Two Northern IrelandElephants venture deep underground at Kitum cave, on the flanks of Mount Elgon, Kenya.GenresFactualScience & NatureBrandNatural WorldSeriesNatural World: 2003-2004 Source: BBC Online