Inside a newly discovered cave in Quang Binh province. (Source: VNA)

The caves have a total length of 11.7km. The search for the new caves involved explorers from the UK, Australia, and New Zealand who had worked for three weeks with support of tour guides and a number of locals.

Howard Limbert, the leader of the team, said that the newly caves are mostly wet, and although they are small, they are quite intriguing compared to many others found in Quang Binh.

Unlike Son Doong, En, and many other caves which have only one main entrance, this new cave system has multiple entrances and exits, he added.

Some of the new are even interconnected, creating multiple cross paths that make exploring inside extremely captivating.

With some 500 caves discovered including Son Doong, the world's largest, Quang Binh is renowned as Vietnam's kingdom of caves.