Watch out for dinosaurs."
I smile at our guide's warning and enter the lush jungle growing inside Hang Son Doong, a three-million-year-old cave in central Vietnam.
Water drips from a gaping scar in the ceiling over 100 meters above us. A spectacular sunbeam starts to creep down the side of the serrated cliffs.
The shrill call of birds and macaque monkeys echoes off the limestone, drifting in from the unseen world beyond the skylight.
"Watch out for dinosaurs. That's what we called this place when we first discovered it," caving expert Howard Limbert, elaborates. The prehistoric atmosphere made the reference obvious.
We continue on, stepping deeper into the void that is considered by some to be the largest cave in the world.
The discovery
Located in the heart of the UNESCO-listed Phong Nha-Ke Bang National Park in Vietnam's Quang Binh province, Hang Son Doong is one of the most captivating adventures that can be experienced in Southeast Asia.
More people have stood on the summit of Mount Everest than have witnessed the surreal beauty inside these enormous chambers.
Translated as Mountain River Cave, it was first discovered in 1990 by Ho Khanh, a local farmer who was seeking shelter from a passing storm in the jungle.
He noticed clouds and the sound of an underground river gushing from a large hole in the limestone, and reported his findings to the British Caving Research Association (BCRA), who were stationed in Phong Nha at the time.
Unfortunately Ho Khanh lost his bearings during his return, and the exact location of the cave remained lost for 18 years.
In 2008 while hunting for food he stumbled across the entrance again, and returned the following year with Howard and Deb Limbert from the BCRA.
They began the exploration of the cave, and in 2010 determined it to be the largest ever discovered in terms of the size of its cross-section.
The news shook the caving world.
The expedition to Hang Son Doong
Campsite in the cave: Hang Son Doong expeditions are physically demanding.
Stretching more than five kilometers long and reaching heights of 200 meters, the main cavern of Hang Son Doong is large enough to house an entire New York City block.
In 2013 Hang Son Doong was opened to the public for the first time, with the adventure tour company Oxalis running the exclusive five-day expedition.
Limiting the tour to only one operator has protected the cave from mass development. Only 10 customers per departure are permitted. Tours run once per week between February to August per year.
The eco-system inside Hang Son Doong is as unique as it is large, and it even has its own localized weather system.
Rare limestone cave pearls are scattered in dried pools, and the largest stalagmite ever found stands 80-meter tall.
Collapsed ceilings have created openings known as dolines, allowing foliage to grow inside the cave. Microscopic organisms thrive in the darkness.
The journey to Hang Son Doong is not for the faint-hearted. Involving two days of intense jungle trekking and river crossings to reach the entrance, nights are spent camping inside the cave and the nearby Hang En, now known to be the third largest cave in the world.
Once inside hikers are expected to abseil, climb, crawl and swim through underground rivers to arrive at the end of the cave. It's an adventure like no other.
Despite the physical demands guests are perfectly cared for, two caving experts, three local guides, two chefs, two park rangers and 20 porters join every expedition.
The scale of the operation is phenomenal, and this ensures everyone's safety and welfare, along with the preservation of the cave, is looked after with expert precision.
New discoveries
Besides the fantastic experience and unique beauty of this adventure, the journey to Hang Son Doong has resulted in a growing industry that has improved the lives of many -- tourism.
The Quang Binh province has long been one of the poorest regions in the country, and was heavily bombed during the Vietnam War.
Unexploded ordnance are scattered throughout the fields and jungle, putting thousands of lives at risk every single day.
Many of the locals collect and dismantle these unexploded bombs, selling the dynamite and metal for scrap.
Countless lives have been lost doing this dangerous practice, but for some there were no other options to help feed their families.
When the colossal caves of Phong Nha were discovered travelers began arriving for the first time.
Villagers embraced this new opportunity and started focusing on tourism. The positive results has seen the local economy flourish.
New community homestays are being built, and the once-impoverished town has been given a new life.
The recent discovery of 57 new caves has also excited the inhabitants of Phong Nha, who have seen their small village quickly become the adventure capital of Southeast Asia.
Passionate locals have created mountain biking, hiking, kayaking and eco-conservation tour companies to run alongside the caving.
Delicate ecosystem
Tourism development poses a potential threat to the environment of the cave.
However a new threat has emerged in recent years, which may compromise the integrity and environmental splendor of the area.
The Vietnamese development company Sun Group has been pushing to build a cable car to Hang Son Doong, which could potentially ferry 1,000 visitors an hour to the cave.
Staunch opposition from UNESCO and activist group Save Son Doong encouraged the Vietnamese government to temporarily halt the construction permits in 2015.
Some argue that this increase in tourism will continue to benefit the local community, while others fear for the destruction of the ecosystem that increased traffic will bring.
Similar projects on Mount Fansipan, the highest mountain in Vietnam, and in Halong Bay have resulted in dramatic environmental damage.
Will history repeat itself with the world's largest cave?
The cable car development continues to loom in the background, and no one knows whether approval will eventually be given.
As one of the last truly pristine environments in the region, Hang Son Doong is a place so remarkable that it demands protection.
One can only hope that a sustainable and responsible decision is made in these critical months.
For now the locals of Phong Nha relish in this new opportunity that the colossal caves have given them, and Hang Son Doong remains as beautiful as ever.
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