Tony discovered Son Doong which was recorded as the largest cave of the world. He decided to come to Vietnam and participate in the journey to the center of this largest cave before getting marriage.

Yet, the majesty of the nature didn't let him disappointed but he didn't know that he is about to step into a REALLY NEW WORLD which he has never known before...

What are waiting for him? How is the underworld?

Discover the story and experience the journey with Tony now!