balcarka cave in the moravsky kras, moravian karst

abyss adrenaline adventure balcarka beauty brno cascade cave cavern claustrophobia column curtain czech dark darkness dungeon exploration explore explorer extreme gorge grotto icicle karst kras labyrinth light limestone mine moravia moravian moravsky natural nature overhang punkevni punkva speleologist speleology sport stalactical stalactite stalagmite stone subterranean tourism underground vault water