A four-day expedition into Son Doong, the world's largest natural cave, is one of the top global bucket list adventures as hailed by travel magazines, though the journey is strictly for rich travelers.
Before the Covid pandemic hit the country in early 2020, a four-day-three-night expedition to Son Doong Cave in the central province of Quang Binh cost VND69.8 million (around $3,000), with Oxalis the only company licensed to bring tourists through Son Doong.
Son Doong's main passage is 3.1 miles long, 660 feet high and 490 feet wide. "The cavern is big enough to fit a Boeing 747 with room to spare," New York Times described.