two of the top three largest known caves in the world. To get there, a punishing path and 90 percent humidity test even the fittest hiker. A walk for the fortunate few: Only a limited number of ...
it was explored and confirmed by the British Cave Research Association as the largest cave in the world. Since its discovery, Son Doong has captivated the world with its enormous size and ...
For just a few weeks a year, sunbeams shine two hundred metres down through a hole in the cave roof, illumining the underground world. Filming this natural lightshow successfully relied on it ...