The underground world was accidentally discovered by people when pumping out the water. Experts here call it the 9th wonder of Earth.

Cave exploration technology is not just talk. The cave exploration technology of the ancients can be said to be too ingenious. Although the fifth great invention has not been recognized, the discovery of a miracle in Long Du district, Zhejiang province, China has Helps cave exploration technology become more stable.

Fenghuang Mountain in Long Du District is actually just a hill. In the 1950s, the villagers at the foot of the mountain moved up the mountain to avoid floods. There are many abysses on the mountain, which the villagers call 'bottomless ponds' because of the high altitude. its depth. There were fish in the pond, enough to fill the villagers' stomachs, and to catch more fish, some villagers considered finding a puddle to drain the water.

In 1992, four villagers finally decided to start draining, they found a few water pumps and started a plan to fish day and night, on the fourth day of pumping, steps appeared in the water, until the next day. On the ninth, they discovered two giant fish - stone pillars shaped like mountain slopes. After 17 days of waiting, the water in the pond finally dried up, the fish were not seen, but in front of the villagers, a magnificent cave appeared. .

They then continued doing nothing, and drained six more lakes, and a total of seven caves appeared before them. The stone cave is complete, magnificent and has a huge scale in accordance with mechanical principles. There are no cultural relics in the cave, only four turtles were found.

 After learning this information, experts immediately rushed over. Even experts with rich research experience were amazed at its ingenuity when faced with this two thousand year old ancient relic. That's right, there are 24 similar caves within one kilometer of these seven. It is also the largest underground complex in the world. It has been dormant for thousands of years and is now visible again.

Its appearance has also attracted the attention of many domestic and foreign scholars, experts call it the ninth wonder of the world. Most historical sites have records to follow, but there are almost no records about Long Du cave. brings not only the magnificence of vision, or a series of eternal mysteries.