poisonous mushrooms growing on the wall of the cave

abandoned adventure agaric aged ancient below catacombs cave cavern caves claustrophobia construction creepy cup dark death deep digging district dungeon earth empty endless engineering excavation exploration geological geology gloomy grebe grotto ground growing hallucinogenic hidden limestone mining mushrooms nobody old petersburg phosphate poisonous rock russia sablino sablinskaya saint sand sandstone scary speleology spooky stone subterranean subterraneous the toadstool underground underpass village wall