The world's largest Vietnamese cave corridors can accommodate Boeing 747

The spring of 2009, Sims as Han Songdong (also called the mountain cave) a member of the expedition was here. This cave reservoir in Vietnam and Laos border rugged peaks tooth has Bang National Park, is the Annan mountains more than 150 caves (a lot of unmanned reconnaissance) part of a woven into the network. The first cave exploration team in Korean pine hole, about 4 kilometers, is a 60 meters high calcite mud blocking the way. They will be the wall is named "the Great Wall in vietnam". They can faintly see with open space and some glimmer of mud on line, but do not know what is on the other side of the wall. A year later, composed of seven simple cavers, few scientists and a team of Porter's expedition returned to here, to climb the wall -- if possible -- and measuring hole in the corridor, and as far as possible to move forward, until the end of the cave.

Han Song cave pit in the section of rock was in the sky, like a castle built in the atoll

Darkness came a voice: "the dog paw, carefully dinosaur." I heard it was Jonathan Sims be a miser with words of British Army cavity in the talk, but I don't know what he was saying. My headlights according to him, this guy is sitting on a wall, a roof covered all over with cuts and bruises helmet under the gray whiskers curled beard. "Then go man!" He shouted, "I am a foot injury."

We're just with a rope across the RaoThuong underground river Pentium roaring, over 6 meters high, edges as sharp as a razor's edge of the limestone, arrived at a beach. I accompanied the headlight beam, last year alone to continue to move forward along the trail.

In front of me, a lot of difficult to walk the road disappeared without a trace of rockfall. Rockfall is from the roof fall, have housing size. Turned and looked back, not worth mentioning headlights light is a large cave space swallowed, I like looking at the night sky without stars. His teammates had told me this cavern space is huge, enough to accommodate a Boeing 747, but I don't know. The darkness is a bag on my head.

In the Hang Ken cave, flow stone formation of huge hole column stands, below the explorers swimming through the deep pool. Hang Ken is one of the 20 caves discovered last year in vietnam.

In order to experience the dark deep, I turn off the headlights. For a start, what also can't see, but with the pupil gradually adapt to the dark, I was surprised to find the front there is a faint light. I'm in between the gravel path selection forward, because excited almost ran, at the foot of the four rolling stones, voice in this invisible hole interior echoes. Climb up a steep slope, over a stone, I can't help stop.

A pillar of light like a waterfall into the cave. Sun roof penetration hole must let person be hardly worthy of belief, nearly 90 meters in diameter. Deep cave light first revealed to me that Han Songdong excite people's mind volume. The cave is about 90 metres wide corridor, the roof from the ground nearly 240 meters high. This space is big enough to hold an entire consists of 40 layers of buildings consisting of the New York block. I can even see repeatedly clouds.

Pouring down the light to illuminate a towering 60 meters of calcite stone pillars, it covered in ferns, palms and other plants of the forest. Stalactites hanging in that huge sinkhole edge, like petrochemical icicles. Several hundred meters long vines from the roof down, swallow in the sun cast a bright light shuttle between subduction. Jonathan Simms catching up. Between us and the sunlit passage stood a stalagmite, silhouette looks like a dog's trotter.

"The name 'hand of God' too cliche," Sims pointed to the stalagmite said, "call the dog claw rock apt, is?" He switched off the lamp inclined body stand, in order to reduce the burden of the injured ankle.