long thin limestone stalactite and opposite stalagmite in punkva caves, moravian karst, czech republic

abyss adrenaline cave cavern czech darkness drip dungeon exploration explore fantasy geologic geological geology gorge grotto inside interior karst kras labyrinth light limestone macocha marble mineral moravia moravian moravsky narrow nature needle punkevni punkva rock scenic shape sharp speleology stalactical stalactite stalagmite subterranean thin tunnel underground unique