▁all ▁known ▁well ▁before ▁under ground ▁expl oration ▁began ; ▁in ▁fact ▁the ▁arch ▁was ▁a ▁popular ▁tour ist ▁att raction ▁in ▁the ▁ 1 9 th ▁century . ▁As ▁early ▁as ▁the ▁ 1 7 3 0 s , ▁the ▁Re ver end ▁William ▁Henry ▁described ▁these ▁features , ▁as ▁well ▁as ▁the ▁s inks ▁of ▁the ▁O wen bre an , ▁Ag hin ra wn ▁and ▁S ru h ▁Cro ppa ▁rivers ▁which ▁he ▁correctly ▁sur m ised ▁to ▁be ▁feed ers ▁of ▁the ▁system . ▁ ▁Without ▁vent uring ▁far ▁into ▁the ▁cave , ▁Henry ▁desc ended ▁to ▁the ▁base ▁of ▁one ▁of ▁the ▁dol ines ▁above ▁the ▁res urg ence : ▁ ▁The ▁stream ▁pass ages ▁at ▁the ▁base ▁of ▁each ▁sh ake hole ▁were ▁first ▁expl ored ▁by ▁Éd ou ard - Al fred ▁Mart el ▁and ▁Dublin ▁natural ist ▁L yst er ▁James on ▁in ▁ 1 8 9 5 . ▁Using ▁a ▁canvas ▁boat , ▁and ▁with ▁cand les ▁and ▁mag nes ium ▁fl ares ▁for ▁light , ▁Mart el ▁and ▁James on ▁found ▁ ▁of ▁pass ages , ▁including ▁the ▁j unction ▁where ▁the ▁three ▁rivers ▁( the ▁O wen bre an ▁and ▁the ▁combined ▁Ag hin ra wn ▁and ▁S ru h ▁Cro ppa ) ▁meet . ▁They ▁drew ▁a ▁map ▁of ▁the ▁discover ies ▁and ▁line ▁draw ings ▁dep ict ing ▁the ▁expedition , ▁not ing ▁the ▁up stream ▁conclusion ▁by ▁boat ▁in ▁the ▁Grand ▁Gallery , ▁and ▁on ▁foot ▁at ▁Pool ▁Chamber