When humans drilled into the depths of the earth's expedition

(00:00:00) Superman's Lonely Fortress!? A huge crystal cave 121 meters underground in Mexico..
(00:11:54) Ancient bacteria, blood red worms When human beings drilled into the crystal cave deep in the earth...
(00:18:56) Dashan, Guizhou was shocked to see "Swallow Cave", the world's largest cave that can accommodate Boeing 747 flight! ?
(00:23:05) "Kuimen World Dangerous" Climbing cliffs and exploring mysterious golden caves, people are shocked to see human bones and murals from heaven! ?
(00:35:27) Hunan called Wudong "Listen to the sound and breathe out"! Thousands of years of ice are hidden inside! ? The Mystery of "Young Dragon" in Flying Tiger Cave! ?
(00:50:07) The legendary "Flying Cat" has found the longest karst cave in China, "Shuanghe Cave".
(00:56:47) The Xiliu Stream that does not want to flow eastwards "Frozen in summer and hot in winter" The mystery of the mysterious summer ice cave!
(01:04:21) Magical and beautiful ice cave for ten thousand years, different days inside and outside, no solution for ten thousand years!
(01:12:23) The hidden beauty of the deepest underwater cave in the Czech Republic... If you want to see the beauty, you must rely on robots to help! ?
(01:14:44) "Ice Cave" on Lake Baikal Photographers captured thousands of ice picks. The picture is surreal!
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