It took nature millions of years to sculpt Son Doong Cave, one drop of water and one grain of sand at a time. It would take human beings an instant to destroy it, if we chose to exploit it in the wrong way, said US Assistant Secretary of State for Democracy, Human Rights and Labour, Tom Malinowski.

Malinowski shared his experience at Son Doong Cave after returning from a five-day trip to the world's largest natural cave with seven ambassadors from May 12-17.

Photos of the seven ambassadors at Son Doong from May 12-17

"It was among the most memorable experiences of my life," he wrote. "It lies in a hidden valley, which we could only be access by passing through another cave. Around every corner, we encountered images that seemed to be taken from abstract art or the illustrations to a fantasy story, not like anything we ever expected to encounter in the real world."

Malinowski saw Son Doong a majestic cave. However, he said the cave was not only beautiful but also very fragile.

"It took nature millions of years to sculpt Son Doong Cave, one drop of water and one grain of sand at a time. It would take human beings an instant to destroy it, if we chose to exploit it in the wrong way. I am therefore very grateful to the people of Vietnam and to the authorities of Quang Binh province for preserving Son Doong cave in its natural state".

The official also said he was impressed by Vietnam’s commitment to preserving its natural beauty and come to the area to see everything that they can.