Намибийн гүний усны агуйд эрдэмтэд судалгаа хийв

Sixty metres below the dry bushland north of Grootfontein, a small hole in the rock leads into warm, wet air. Explorers who descend through the entrance of Dragon’s Breath Cave move from Namibia’s surface heat into a hidden chamber where a lake fills the darkness below.

The cave lies in the Otjozondjupa region, about 46 kilometres from Grootfontein. Its entrance is modest, but the water beneath it covers almost 2 hectares, roughly the size of two football pitches. The lake has been mapped to 264 metres deep, according to details on Dragon’s Breath Cave, making it one of the most remarkable underground water bodies known.

The core discovery is not only the size of the lake. Dragon’s Breath Cave is also a rare underground habitat, holding animals adapted to total darkness and a food supply that depends on bat droppings filtering down from above. That combination of scale, isolation, and life has made the cave a place of scientific interest as well as a demanding target for explorers.

A Hidden Lake Below Dry Ground

Namibia’s underground lake was discovered in 1986 by South African explorer Roger Ellis during a speleology expedition. He returned in 1987 with cavers and divers from the South African Speleological Association, who worked through drops, ledges, and vertical pitches before reaching the water.

Their measurements showed a lake surface of about 2 hectares, or 4.9 acres. From above, there is little sign of the flooded chamber below. The contrast is part of the cave’s appeal: a dry, rocky surface hides a vast body of water suspended in darkness beneath the landscape.

The cave formed through karst dissolution, a slow geological process in which groundwater wears away soluble rock. Over long periods, that process creates voids, shafts, chambers, and flooded passages. A Travel Namibia report by Linda de Jager describes the system as 60 metres below ground, reached through a small ladder and passages leading toward the lake chamber.

The name comes from the cave’s warm, humid airflow. During a visit with entomologist John Irish, who had been part of the 1986 discovery team, de Jager described the “dragon’s breath” as a warm breeze forced upward through a small hole between rocks near the roof of the lake chamber. In some conditions, the air condenses into mist at the entrance.

Divers Reached Limits Before Robots Found the Bottom

For decades, the full depth of the world’s largest underground lake remained uncertain because the site is hard to enter and dangerous to dive. Every dive begins with a logistical problem: heavy technical gear must be carried down through shafts and passages before anyone can even reach the water.

In 2015, a major expedition sent divers to 132 metres, which the source material describes as the limit of human endurance and technical diving at that time. The lake bottom still remained out of reach. Long descents, darkness, and decompression meant human divers could push only so far.

In 2019, Stone Aerospace mapped the lake using Sunfish autonomous drone, an AI-powered underwater system built for cave exploration. Using multi-beam underwater mapping, it found the bottom at 264 metres. Expedition leader Vickie Siegel described Sunfish as the first autonomous system to explore a totally unknown place inside the Earth.

Exploration did not stop with the robotic survey. In 2023, a human expedition reached around 160 metres during a nine-hour dive while exploring an uncharted part of the cave network. That dive showed that Dragon’s Breath Cave still contains areas that experienced teams are working to document.

The 2024 Team Carried 1.5 Tons to the Water

A detailed InDEPTH expedition report by Oliver Schöll, published on November 6, 2024, shows the scale of the work required. The six-day expedition included Tom Baier, Alan Calovs, Louw Greef, Stefan Gries, Stefan Pape, Oliver Schöll, Markus Schuster, Chris Steencamp, and Ralf Wupper.

The team trained for a year because their target lay about 60 metres below the surface, where an injury in the cave could quickly become serious. A 2023 exploration had revealed another challenge: there was no land to stand on near the dive site. The team would have to build its working base on floating pontoons.

To prepare, the divers practiced lowering themselves into inflatable boats from a three-metre platform, putting on drysuits and rebreathers in the water, and making the process faster. They reduced the time needed from about 20 minutes per person to 7 to 10 minutes, a practical improvement in a cave where effort and exposure matter.

The 2024 Dragon’s Breath expedition left for Namibia on June 12 with more than 800 kilograms of equipment. After arriving in Windhoek, the team drove about 450 kilometres to Haarsieb Farm near Tsumeb. At the cave, they moved about 1.5 tons of gear over 200 metres to the entrance, then carried it down toward the water.

Inside, the conditions were harsh before the diving began. On June 16, the team moved heavy rebreathers and other gear down the shaft in 100 percent humidity and a temperature of 30 °C. On June 17, the divers entered water measured at 25 °C, with planned dive times of up to 10 hours.

At 60 metres, the divers reached the floor and secured the reel while the main passage ahead sloped downward at 30 to 40 degrees. Schöll reported that video lights rated at 50,000 lumens lit the cave like daylight, yet the passage still showed no visible ceiling or walls even with 100 metres of visibility.

Rare Life Survives on a Fragile Food Chain

Dragon’s Breath Cave also shelters animals adapted to clear water, stable temperatures, and permanent darkness. The best known is the blind golden cave catfish, Clarias cavernicola, described in the source material as one of the rarest and most isolated fish in the world.

The cave also holds sightless white prawns and Trogloleleupia dracospiritus, a small endemic amphipod whose Latin name means “spirit of the dragon.” These animals live far from sunlight and from the surface ecosystems that support most aquatic life.

Travel Namibia’s account says the amphipod and most other life forms there survive on bat droppings that filter down to the bottom of the lake. John Irish described the cave as a huge but largely lifeless lake that shelters an unlikely animal community in a few barely hospitable corners.

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