Longchao Lake, a mysterious lake located in southwest China's Chongqing Municipality, swells and shrinks three times a day!

With no ditch or other lakes nearby, how does the lake come up with three regular one-hour swells-and-shrinks at 8 am, 12 am and 4 pm respectively every day?

Chongqing Economic Times reported that the lake's mysterious moves have finally prompted a latest scientific investigation of the lake organized by Chongqing Exploitation Association and local hydrology and geology experts. The two-day investigation starts on Friday.

Mysterious Longchao Lake located in Southwest China's Chongqing Municipality.

The report says the team will take a boat to the centre of the lake where three obvious "water holes" are pumping up waters everyday from the lake's underground. The team will also investigate a tree-leaf-covered deep pit that lies in the mount cliff about 20 meters away from the lake centre, as they suspect it might account the major reason for the strange siphon phenomenon of the lake.

According to experts, Longchao Lake right lies on a karst land formation, or a calcareous rock stratum. The three "water holes" in its cenre might connect their underground siphon tonnels. With the help of their "air hole", the deep pit on the lakeside cliff, undergound water in the siphon tonnels could naturally spray and shrink, just like human respiration.

Dating back to 1982, a severe drought hit the area but the three "water holes" in the lake still pumped out waters for three days. And tens of thousands of snakes also came out of the holes.

Local tourism administration is also planning to make the area of the mysterious lake a tourist site.