@.know.australia.b: City of Opal 💎⛏️ Deep beneath Coober Pedy lies a unique underground stay — once connected to the town’s opal-mining history, now transformed into a cool and unforgettable hotel experience. 🇦🇺✨ #CooberPedy #CityOfOpal #UndergroundHotel #OpalMining #SouthAustralia