Vietnam
Tu Lan Cave System
Subterranean rivers winding through pitch-black caves where you swim wearing a headlamp and lifejacket.
The headlamp catches the water and then nothing else. Pitch black. You're swimming through a flooded cave passage with a lifejacket holding you up and a current pulling you forward. The ceiling is somewhere above — close enough to hear your breathing echo off it. Then the cave opens into a chamber and the porters are cooking dinner on an underground beach.
The Tu Lan cave system sits within Phong Nha-Ke Bang National Park, a multi-cave expedition that combines jungle trekking, river swimming, and underground camping. The route crosses rivers, scrambles over boulders, and pushes through primary forest between cave entrances. Several of the caves require swimming through flooded passages in total darkness. Camp is established on a subterranean sand beach, where expedition porters prepare meals over an underground fire. Only one operator — Oxalis Adventure — runs the Tu Lan expedition, with group sizes capped at eight to minimise environmental impact. The system was first explored by the British Caving Research Association and remains partially uncharted.
Solo
Eight people, three days, no phone signal, and caves you swim through in the dark — Tu Lan strips adventure travel to its most elemental form.
Friends
Swimming through flooded caves by headlamp and camping underground on a sand beach — the shared intensity of Tu Lan creates the kind of bonds that outlast any beach trip.
- The expedition involves swimming through flooded cave passages in total darkness wearing a headlamp and lifejacket.
- Camp is set up inside the cave on a subterranean sand beach — dinner is cooked by porters over an underground fire.
- The jungle trek between caves crosses rivers, scrambles over boulders, and pushes through dense primary forest.
- Only one operator runs the Tu Lan expedition — group sizes are capped at eight for minimal impact.
Pork belly grilled on bamboo skewers over a jungle campsite fire.
Jungle fern salad tossed with peanuts and lime juice by the expedition porters.
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