The weather conditions inside the cave have nothing to do with the external environment where there is drought. The "Er Wang Dong" cave was an enigma for experts who use ropes to go down to the cave and admire its unknown world up close.
Manchester photographer and speleologist Robbie Shawn is one of 15 explorers who spent an entire month observing the weather system.
"All the main passages of the cave are deep, underground and have never seen the light of day. In some openings of the cave, we had the opportunity to swim in the turquoise waters that resemble a pool," he told the British newspaper "Telegraph".