Son Doong Cave in Quang Binh province, central Vietnam, was worldwide known in 2009, when a group of British explorers and locals discovered the whole cave. Since then, the world has been surprised by spectacular scenery of the vast cave with a length of more than 9 km, with forests, rivers, stalagmites... All are inside the Son Doong cave, the world's largest cave.

To enter the cave, explorers had to use ropes to drop down 80m depth to begin the journey to explore the world in Son Doong cave.

Four years after the cave was revealed to the world, the tour to conquer Son Doong cave was tested in August, opening up the opportunity to explore the cave for tourists.

The test will continue in February and March 2014. Each group of tourists will have up to six people, with the cost of $3,000. More than 100 international visitors have registered for the tours in 2014.

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