Ambassadors from seven countries concluded their exploration of the world’s largest cave at Son Doong in the central province of Quang Binh on May 17.

The five-day trip saw ambassadors from Argentina, Australia, Canada, the Czech Republic, Italy, Sweden and the UK and the US Assistant Secretary of State Tom Malinowski and Miss Universe Vietnam 2008 runner-up Duong Truong Thien Ly explore the cave system in a delegation led by Ambassador Pham Sanh Chau of the Vietnam Ministry of Foreign Affairs' Culture and UNESCO Department.

The ambassadors explore Son Doong Cave (photo by Oxalis Adventures)

The diplomats said that the trip was a unique lifetime experience and they would share their images on social media.

All of the ambassadors were in good health after hiking through a rain forest, hanging on ropes in the hundred-metre high cave, climbing mountains, swimming in underground rivers and experiencing heavy forest rains.

US Assistant Secretary of State Tom Malinowski said that Son Doong was among the most wonderful places that he had ever visited. Meanwhile, the Australian Ambassador to Vietnam, Huge Douglas Borrowman, said that the beauty of Son Doong cave was beyond his imagination, and he was very excited about the trip.

On May 16 evening, the diplomats met with local officials and talked with the press. The Quang Binh provincial People’s Committee gave the ambassadors a badge to remember the adventure.

Ambassador Pham Sanh Chau of the Vietnam Ministry of Foreign Affairs' Culture and UNESCO Department (photo by Oxalis Adventures)

The US Assistant Secretary of State Tom Malinowski (photo by Oxalis Adventures)

Crossing mountains and streams to go into the cave (photo by Oxalis Adventures)

The gate of the cave (photo by Oxalis Adventures)

A spectacular beauty (photo by Oxalis Adventures)

The ambassadors carrying out their national flags (photo by Oxalis Adventures)

They are singing songs composed by themselves during the exploration (photo by Oxalis Adventures)

The photo was taken after finishing the trip