From Woomera all the way to the north, it has reached a very magical place. On the mainland of Australia, there is a wealth of mineral resources in the underground, and it is rich in oil ~ and Coobpetti in South Australia. You must come to see the mining hole of opal gemstones. All the gemstones are hard to come by. Just like the gold rush, it is hard to imagine how the miners at that time lived and worked here. Now there is the original Opal exposed on the wall for the visit. The lecturer will be patient to tell you a story about Opal~ Of course, you can still live underground, there is really a room here. Its a bit like the cave hotel in Cappadocia, Turkey, but its still a little different. The caves in Kappa are basically on the ground, and the underground city hotel in Cooberti is really underground. of. .