Here is the top list of mysterious sunken underwater cities in the world found underwater! These strange and mindblowing but also amazing forgotten ancient underwater ruins are located deep into the ocean. Check out Alexandria, City of Cuba, Yonaguni, Lake Titicaca, Pavlopetri, Lion City, Heracleion and more underwater cities!

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1. Yonaguni Pyramids
In the mid 80s, Divers found underwater rock terraces and pyramids off the coast of Yonaguni Jima. Yonaguni Jima is an island that lies near the southern tip of Japan's Ryukyu archipelago, About 75 miles off the eastern coast of Taiwan. At first scientists believed they might be natural formations, but There are quarry marks and some writing on the stones and animal statues that have also been found underwater. Now some experts believe that The structures Could be what is left of the mythical city of Mu, a fabled Pacific civilization rumored to have vanished beneath the waves. Masaki Kimura, a marine geologist from the University of Japan, Has been studying the underwater pyramids for over 15 years. The underwater structures include castle ruins, a triumphal arch, five temples and at least one large stadium, all of which are Connected by roads and water channels and are partly shielded by what could be huge retaining walls. Kimura believes the ruins date back to at least 5,000 years, based on the dates of stalactites found inside underwater caves that he says sank with the city. The theory is that the ancient underwater city Might have been sunk by an earthquake or tsunami around 2,000 years ago. Yonaguni invites tourists and researchers to dive freely around the site.
2. Sunken City of Cuba
In 2001, A company called Advanced Digital Communications (ADC) was working with Fidel Castro's government to explore Cuban waters looking for sunken Spanish ships loaded with treasure. Their Sonar equipment picked up a series of geometrical structures lying on the bottom of the ocean. Here's a computer generated image of the pyramids and other structures found underwater.
The structures and design made it look like there was A gigantic underwater city at the bottom of the Bermuda Triangle. The media went crazy claiming that Atlantis had been discovered in Cuba. There are local legends of the Maya and native Yucatecos that tell of an Island inhabited by their ancestors that vanished beneath the waves. If it's true the structures were made by an ancient civilization, they would have been the Most technologically advanced structures on the planet at that time. Scientists estimate that they would have been built about 50,000 years ago which doesn't seem very likely. The numerous structures and cities that have been discovered underwater around the world Lie less than 120 meters (or 395 feet) below sea level, which comes as no surprise since the sea level never fell below this mark during the time Homo sapiens walked the earth. This Cuban city, if we can call it that, is the Only exception since It is submerged over 700 meters (2300 feet) underwater. If the large structures are actually pyramids, 2 of them are Even larger than the pyramids of Giza and Cheops in Egypt. As of yet there is no plausible explanation for the existence of this city and ADC is still trying to investigate the site.
3. Lake Titicaca
Lake Titicaca is Located in the Andes between Bolivia and Peru. It is the largest freshwater lake in South America and was the cradle of Peru's ancient civilizations, including the Inca. Their presence can be seen on Lake Titicaca by the ruins they left behind, including A mysterious underwater temple thought to be between 1,000 and 1,500 years old. In the Incan creation myth, The god Con Tiqui Viracocha emerged from Lake Titicaca. After commanding the sun, moon, and the stars to rise, Viracocha created more human beings from stone. After bringing them to life, Viracocha Commanded them to go and populate the world. The Incas therefore believed that Lake Titicaca was their place of origin, and that upon death, Their spirits would return to this lake. Archeologists located a huge temple in 2000 after following a submerged road (and I'm sure following advice from locals). After 18 days of diving below the clear waters of Titicaca, scientists said they had Discovered a 660-foot long, 160-foot wide temple, a terrace for crops, and a 2,600-foot containing wall along with gold and statues. It is said the lost city was Covered with sediment during a great flood of biblical proportions and local people had passed down the stories of the underwater temple and flood from generation to generation.