cetatile ponorului cave

above abseil abseiling abyss adventure angle background bihor blue calcite cave caver cavern cetatile challenge chasm climb climber cold courage crystal danger dark deep descend discover dissolve drip earth escape exit exploration explore extreme formation gallery gear gem geology grotto hall hole interior light limestone mineral mystery natural nature outdoor padis passage ponorului quiet rappel rappelling rhinestones river romania rope safety secure sky speleologist speleology spelunker spelunking stalactite stalagmite subterranean suspend time timeless translucent transparent tunnel under underground vertical water