Son Doong Cave Expedition in Phong Nha
A visual guide from the Phong Nha travel guide — see all posters in Visual Guides.
Hang Sơn Đoòng is the largest cave passage ever measured: a local logger, Hồ Khanh, stumbled on it in 1990, lost it, and helped British cavers relocate and survey it in 2009. Inside are skylight jungles where the roof collapsed, a rushing underground river, cave pearls and passing clouds beneath a ceiling some 200 metres high — and a strictly limited expedition that has become one of world travel's great bucket-list items.
What the Expedition Involves
Access is by multi-day guided expedition only — currently through a single licensed operator — with a jungle trek in, a night camped in cavernous Hang En, then days traversing Son Doong itself: river wades, harnessed rope sections and the climb over the calcite 'Great Wall of Vietnam' near the exit. Porters, guides and a safety team handle the logistics; you need genuine hiking fitness, not mountaineering skills.
Cost, Waitlist & Alternatives
Expect a price around US$3,000, roughly a thousand places a year, and departures — generally January through August, outside flood season — that often sell out around a year ahead, so book far in advance and train for it. If the cost or waitlist rules it out, the same guides run superb cheaper expeditions: Hang En's cathedral campsite, Hang Va's strange stalagmite fields, or the Tu Lan river caves about an hour away.