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 In 1985 a scuba diver -  Kihachirō Aratake was diving 76 miles from the coast of Taiwan. What he discovered were the remains of some lost civilization including perfectly designed pyramid complete with steps culomns and a human face carved inside the rocks. Masaaki Kimura - a marine geologist, belives that these are the ruins of a Japanese Atlantis - an ancient city sunk by an earthquake about 2,000 years ago. But that's his opinion. Many other scientologist argue that this is the result of a natural phenomena and are not convinced that these structures are manmade. Until today it is unsure how did it all happen. But the most popular and accurate theory says that the world's largest tsunami in 1771 might have actually befallen the ancient civilization, bacuase it is hard to belive that all these depictions of animals carved in the stones, aesthetic triangles created by themselves.  https://www.nationalgeographic.com/news/2007/9/yonaguni-jima-japan-underwater-city/

This underwater river is located in the Yucatan Peninsula in Mexico and it's called Cenote Agnelica which means Little Angel in English. It is 180 feet below the ocean surface. But what's the most interesting about this river is how it's created. Well, it is formed with a very thin layer, called "halocline", of hydrogen sulfate, which separates fresh water and the salt water and would kill you if you tried to breath it in. Misty and smokey view scuba divers can enjoy swimming thorugh is created due to the sharp contrast in salinity  On the both sides of the river there are also trees, leaves and grass which makes it look like a normal river on the ground even more!  https://www.youtube.com/watch?v=R8ma9bvYHUw&t=176s https://www.sciencealert.com/divers-are-exploring-this-giant-underwater-river-shrouded-in-a-cloud-of-toxic-gas