The cave, named Thang Cave (Victory Cave) after the local resident who first identified its location, is considered a significant geological discovery with potential for scientific research, conservation and adventure tourism.
Jungle Boss Co. Ltd. said its expedition team, working with the management board of Phong Nha-Ke Bang National Park, surveyed the cave over six days after receiving information about the site on June 3.
Located in the Ma Da Valley between Elephant Cave and Ma Da Lake, the cave lies within the park's strictly protected zone.
Preliminary surveys found the cave to be about 3,000 metres long and 70 metres wide on average, with some chambers extending more than 100 metres across. It has two entrances leading to two separate branches.
The entrance covers about five square metres, while the exit is narrow enough for only one adult to pass through at a time.
The cave contains extensive stalactite formations and numerous clusters of unusually large cave pearls, a rare geological formation created as mineral layers gradually accumulate around tiny particles.
The discovery is expected to strengthen scientific research and conservation efforts while supporting the future development of adventure tourism in the UNESCO-listed national park.