lets ▁to ▁the ▁main ▁passage ▁are ▁numerous . ▁Some , ▁such ▁as ▁the ▁large ▁" M ist ake ▁Pass age " ▁have ▁been ▁pushed ▁only ▁a ▁short ▁distance . ▁Since ▁the ▁cave ▁is ▁under going ▁active ▁expl oration , ▁there ▁remain ▁many ▁issues ▁to ▁be ▁sorted ▁out ▁and ▁the ▁s inks ▁for ▁many ▁of ▁these ▁in lets ▁remains ▁unclear . ▁The ▁stream ▁passage ▁itself ▁is ▁of ▁considerable ▁proport ions ▁in ▁parts , ▁but ▁also ▁contains ▁many ▁higher ▁level ▁foss il ▁pass ages ▁which ▁have ▁been ▁desert ed ▁by ▁the ▁stream . ▁The ▁cave ▁contains ▁numerous ▁cal cite ▁form ations , ▁with ▁large ▁amounts ▁of ▁hel ict ites ▁in ▁places . ▁B ould er ▁ch okes ▁are ▁frequent ▁with ▁several ▁parts ▁of ▁the ▁cave ▁being ▁quite ▁un stable , ▁especially ▁the ▁J CP ▁passage . ▁ ▁Location ▁ ▁While ▁the ▁location ▁of ▁the ▁entrance ▁to ▁the ▁cave ▁is ▁in ▁County ▁F erman agh , ▁the ▁majority ▁of ▁the ▁cave ▁lies ▁under ▁County ▁Cav an . ▁The ▁original ▁entrance ▁to ▁the ▁cave ▁was ▁in ▁Cav an ; ▁however , ▁this ▁is ▁now ▁in access ible . ▁The ▁current ▁entrance ▁of ▁Pol lt ul ly ard ▁is ▁located ▁north ▁of ▁the ▁Mar l bank ▁area ▁of ▁F erman agh , ▁high ▁in ▁the ▁mo ors . ▁ ▁Ex pl oration ▁history ▁▁ 1 9 8 0 s : ▁Disc overy ▁and ▁initial ▁expl oration ▁ ▁The ▁cave ▁was ▁discovered ▁in ▁August ▁ 1 9 8 0 ▁by ▁members ▁of ▁the ▁Rey f ad ▁Group , ▁the