Thanks to discoveries made at some stage in a latest expedition in Vietnam, it seems the sector’s largest cave, Son Doong, is even bigger than previously notion.
Last month, a trio of British divers — the equal divers who aided in the rescue of the trapped soccer group in Thailand in 2018 — ventured to Phong Nha-Ke Bang National Park, within the jungle-crammed Quang Binh Province of important Vietnam, to explore the cave’s waterways.
During the groundbreaking dive, they found a brand new underwater tunnel that connects Son Doong (that means “Mountain River Cave”) with any other widespread cave known as Hang Thung.
Son Doong presently measures a total of 38.5 million cubic meters (about 1.35 billion cubic ft). When it’s formally linked with Thung Cave, it’ll add an additional 1.6 million cubic meters in volume.
“It might be like someone located a lump on top of Mount Everest, making it another 1,000 meters better,” says Howard Limbert, technical marketing consultant of the Quang Binh-primarily based Oxalis journey excursion employer and one of the cave experts who helped organize the dive.
He tells CNN Travel, “Any cave within the global can be able to match without problems inside Song Dong whilst it is related — it is just outrageous in length.”
Oxalis, which is the simplest organisation licensed to deliver tourists into Son Doong Cave, invited the British divers — Jason Mallinson, Rick Stanton and Chris Jewell — to visit the cave following the Thai rescue excursion.
“The divers did an extraordinary task rescuing the children in Thailand. We invited them on a trip to Son Doong to thank them for their exquisite effort,” says Limbert.
“They wanted to do some thing thrilling all through the ride, so we came up with this concept of diving Son Doong, which had in no way been achieved before.”
Limbert says that the Oxalis group already knew that the water from Son Doong joined Thung Cave, via dye-checking out, but no human has ever gone into these subterranean rivers.
During the challenge, divers were able to reach a intensity of about seventy eight meters at the same time as diving on air (oxygen and nitrogen) before turning round.
“When the divers reached seventy eight meters, they plumbed the intensity under the use of a line and a lead weight. Hence, they consider the offshoot reaches a intensity of a hundred and twenty meters and keeps for about 1 kilometer,” explains Limbert.
The crew wasn’t looking ahead to the tunnels to be so deep, due to the fact the alternative caves inside the region are quite shallow.
“Now that we realize how deep it’s miles, we’re going to carry the unique gases [oxygen-helium mixture] with us next time to permit lengthy, deep dives,” provides Limbert.
The divers plan to return in April once more subsequent 12 months. This is the exceptional time of yr to dive, due to the fact water levels are especially low, and visibility is higher than ordinary — even though nevertheless only approximately one to two meters.
“I suppose it’s superb that some thing as important as the world’s largest cave continues to be being explored and higher understood,” says Limbert.
“No one had ever set foot interior Son Doong until 2009 … And this contemporary discovery shows there are nevertheless an awful lot of factors to find on the planet. It’s honestly exciting.”
One of the arena’s most precious natural wonders, Son Doong was inadvertently discovered by Vietnam resident Ho Khanh in 1990.
“While looking within the jungle, Khanh came throughout the opening. He felt a blast of wind and heard the push of a river inside… But after he left, he could not find it once more, as it’s surrounded by way of foliage,” says Limbert, who became part of the British Cave Research Association (BCRA) team that first set foot internal Son Doong.
“Khanh spent many, many years seeking to rediscover the mouth of this cave and, sooner or later, in 2009, he led us there. We found out proper away that it was most important.”
After the BCRA explored and measured the cave, they proclaimed it the most important within the global in 2010 — so massive that you can match a New York City block with forty-tale skyscrapers inner it, in keeping with Oxalis’s estimations.
Within the gigantic limestone cavern, there are various microclimates and numerous scenery which include two jungles, made possible via dolines — openings created by way of collapsed ceilings — where sunlight streams in.
“So some distance we’ve got most effective explored approximately 30% of Phong Nha-Ke Bang National Park, so there is plenty more to be determined,” says Limbert.