In a recent article, the paper quoted a group of travelers who explored the world’s largest cave as saying that it is “a sanctuary, a lost world below the surface - a unique ecosystem.”

The journey of the six-member team through the cave took four days of arduous climbs interspersed with spectacular sights, such as some of the world’s most imposing stalagmites, fast-running streams, and an underground forest.

Son Doong Cave has been recognised as the largest of its kind in the world by three international organisations, including Guinness, the Association World and WorldKings.

The cave is located in the heart of Phong Nha - Ke Bang National Park in Quang Binh province. Son Doong was discovered by a local in 1991. It was first explored in 2009 by the British Cave Research Association and has been open to the public since 2013.

The 1,645m-long cave system, which extends through a mountain, was named one of the most captivating caves on earth by National Geographic.-VNA