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The Son Doong Expedition has been listed worldwide as one of the top bucket list adventures, where you get to adventurously explore the largest cave on Earth, Hang Son Doong, over a span of 4 days and 3 nights. Exploring, sleeping and even breathing inside the largest underground cave on the planet is a once in a lifetime experience!

  • The world’s largest cave
  • Rope traversing and climbs
  • Ascent of the "Great Wall of Vietnam"
  • Gigantic formations
  • Best underground campsites on Earth
  • Underground river crossings
  • Rocky terrain and scrambling
  • Duration: 4 day tour
  • Availability: Jan to Aug 13-15 trips/month
  • Difficulty: Level 6 - Hard
  • Group size: 6-10 people 18+ years old
  • Distance: 17km trekking, 8km caving, 600m elevation change, 90m climbing (the Great Wall of Vietnam)


Due to the weather conditions the itinerary may need to be changed at short notice. The paths can be muddy and slippery after rain.


Special Comments:

Reach Dong Hoi no later than 02:00 PM on the afternoon of your briefing day, where you will meet our driver and transferred to Son Doong Bungalow in Phong Nha.

Around 05:30 - 06:00 PM, you will congregate in the hotel restaurant before moving to Oxalis Headquarters, where you’ll meet your cave expert and guide team for your safety briefing and equipment check. The briefing is mandatory. Anyone who chooses not to join the briefing may be eliminated from the tour without refund.

Have all required belongings prepared before the briefing. Your belongings will be collected after the briefing in individual large bags and sent to our porters to prepare for the following day.You will receive it each evening upon reaching the campsite. Keep anything you want to take with you during the day in a separate backpack (cameras, tripods etc.). Before dinner, you will be given your helmet for the trip; the helmet will be your responsibility for the duration of the tour.

Please note that the Release Form needs to be signed at the safety briefing. After that, enjoy welcome dinner with your team at around 07:30 PM at Oxalis headquarters, after which you will be transferred back to your hotel.


Enjoy breakfast at 08:00 AM before departing at 09:00 AM for the first leg of the expedition. You’ll leave extra luggage and any valuables at Oxalis headquarters before setting off for adventure.

After a 45 minute drive along Road 20 of the Ho Chi Minh Highway you’ll reach the trailhead, where you’ll start trekking for approximately 1 hour downhill through the forest, which is quite steep at times. Walk for half an hour along a small stream to the minority village of Ban Doong, which is a real highlight for many on this expedition. Learn more about this unique ethnic group of people and enjoy lunch in the village.

After this point, you will be in the sun all afternoon with about 2 hours along a river, with very little shade. You’ll cross the river many times so please expect to have wet feet for the whole day. In the summer, the water is only usually knee deep, but Gore-Tex boots will fill and hold the water so therefore they are not recommended (please see our detailed FAQ for footwear recommendation).

You’ll then reach the entrance to Hang En Cave, home to thousands of swifts. Here you’ll be given your headlight and you will trek/boulder approximately 20-30 minutes to your campsite inside the cave. The group should arrive at camp around 03:00 – 04:00 PM where you can enjoy swimming and washing within the underground river. Dinner will be served at the spectacular campsite with numerous photographic opportunities.

Anyone who is unable to complete any stage of this first day comfortably will be turned around to Phong Nha and will not be permitted to continue the expedition. This will be the decision of the safety team on your tour. Should you be turned around, all tour costs will be forfeited.


You’ll again begin your day with a delicious breakfast at around 08:00 AM. You’ll be in for a very tough day today so it’s best to enjoy a big breakfast, as you’ll need your energy!

Start your trek at 09:00 AM through Hang En Cave for about 30 minutes to reach the magnificent exit, made famous by many photographers over the past few years. You’ll scramble down to the river valley and then it’s an hour walk through the river, so your boots are going to be wet for most of the day; it is unavoidable, yet part of the fun.

You’ll then start climbing a steep hill for about 45 minutes with some rocky sections to start. At the top of the hill you’ll enjoy lunch, a safety briefing and fit your safety harness and prepare for your big journey underground. A steep descent with a couple of short rope climbs brings you at last to Son Doong entrance.

With your safety harnesses, you’ll then start the 80m descent into the cave by making a number of short climbs, using ropes and safety lines with your guides’ assistance. There is no rappelling or abseiling at any point during the expedition. You’ll then enjoy a few more climbs and bouldering to reach the first and second river crossings inside the cave, which are no more than knee-to-thigh deep depending on the water levels. You should have a wash here, as it will be the last washing place for the day.

On your way to the first campsite in the first large passage of the cave, you’ll have to be extra careful as there are a number of big drops and scrambling over boulders along a rocky path before reaching one of the most spectacular views: Hand of Dog and daylight streaming through the cave, thanks to the first doline! You will then scramble down to the first campsite of Son Doong around 03:00 - 04:00 PM. After a tea and coffee break we will head down to view the ancient fossils. Here there is a chance for a short and cool swim, but no washing. You’re in for another big meal with your team before turning in for the night.

Please note that there are no washing facilities at camp on this day.


Your day begins with a hearty breakfast with your team before a 09:00 AM departure towards your second campsite in Son Doong Cave. You’ll start with some rocky climbs, which are quite steep in some places, as you reach the first jungle within the cave at Watch Out for Dinosaurs. It will take about 1.5 hours to travel within the cave from Camp 1 to Watch Out for Dinosaurs. We will spend some time here taking photographs and then you’ll be going down the rocky path to reach the enormous Green Gours, one of the most magnificent and famous photography spots on the tour! A light lunch is provided with an incredible backdrop of the first doline. If you are lucky you may even catch some sunbeams, which make for truly spectacular photos.

It is then a walk through the cave past gigantic formations and plenty of cave pearls towards the light of the second doline and main jungle within the cave. Follow the path past the beautiful foliage reaching towards the light, to reach the underground jungle, unlike anything you could experience on the planet! Cross the jungle for around 30 minutes to reach the steep and sometimes slippery path down to your second campsite within Son Doong Cave. You will reach camp around 02:00 - 03:00 PM.

After a short rest at your campsite, you are back on your feet and heading deeper within the cave. You’ll pass through a very large dry passage with huge stalagmites and great views back to the second doline. Many new creepy crawlies have been discovered within this passage including white spiders, fish, woodlouse and shrimp species, so be sure to keep your eyes open. You will have many great opportunities for photography here.

You’ll be back at camp again around 05:00 PM to enjoy a sensational dinner with your team and delight yourself with an evening of games and entertainment, or simply relax and soak up the views at what is quite possibly the very best campsite in the world.

Quick note: you may use a pair of dry boots on this day, as aside from the mud, there are no water crossings! Also, there are no washing facilities at camp on this day.


After refueling with another hot breakfast you’ll pack up camp and start heading towards the Wall of Vietnam. Scaling this wall will use a combination of ladders and ropes, but you will always have a safety line and people to look after you. After this strenuous ascent, you will see the light from the exit. At the top of the Wall, you will enjoy your picnic lunch before passing more flowstones and cave pearls; see the calcited animal skeleton then emerge into the jungle again.

A short but steep and rocky path will lead you down to the bottom of the hill, followed by and a short hike to the road. Cold drinks await you at the top of the hill before a 45 minute drive back to Chay Lap Farmstay & Resort where cool towels and a refreshing swimming pool are waiting for you. You will have time to relax after your long trek before enjoying a group farewell dinner with your fellow expedition team members.

Please advise our sales team in advance of your departure time so that they can arrange the logistics of your transfer back to the airport or train station. If you would like to extend your holiday in Phong Nha, let our team know so that we can assist you in booking extra nights at Chay Lap Farmstay & Resort.


Enjoy breakfast at the hotel and the check-out time of the hotel will be 12:00 PM regardless of your departure time. Why not take this as your opportunity to get to know more about Phong Nha beside the expedition, by staying for some extra days?

You will be blown away by the remarkable scenery, being surrounded by karst mountains, idyllic green rivers, rustic villages with beautiful local people. There are so many places to go and see (Chay Lap Water Sport Center, Paradise Cave, Phong Nha Cave, Mooc Ecotrail, Dark Cave..); sensational local pubs (Easy Tiger, Moi Moi, Pub with Cold Beer..); motorbike/bike tours through the National Park, Bong Lai Valley.

If you are still in the mood for the wild, our one to two-day adventure tours in another marvelous area – Tu Lan Cave System, are highly recommended (see more here). Since the cave system is the home of the Hollywood blockbuster movie Kong: Skull Island, you will have a great experience enjoying the landscape and imagining the legendary King Kong!

Our driver will pick you up according to your departure time and don’t forget to let us know in advance if you would like additional night(s) at the hotel and we can reserve that for you.

Adventure Level 6: Hard

  • 4 day tour
  • Moderate to hard trekking - very rocky terrain
  • 25km trekking
  • 7km of caving which includes rope climbs, rocky scrambling, and the 90m ascent of the Wall of Vietnam (technical sections with instruction, supervision and safety equipment).
  • Total elevation gain: 800m
  • Surface and underground river crossings
  • 3 nights camping underground

Frequently Asked Questions

  • What if I am a solo traveler, can I join a group?

    Solo travelers are most welcome and make up a large percentage of most groups.

  • Why do I have to sign your Release Form?

    We require customers to sign our Release Form to confirm they accept this is an adventure tour and they have to follow our guide’s instructions and safety rules. Customers also accept they have some responsibilities for their own safety.

  • Why Son Doong Cave tour is USD$3,000 per person?

    Son Doong Cave is currently the world’s largest cave and it is environmental sensitive therefore the Government of Quang Binh province issued a regulation that allows only 1000 tourists can visit the cave each year, each tour normally 10 tourists. In order to manage the cave sustainably, only one operator to be appointed to run tours to Son Doong and Oxalis Adventure was appointed as the only operator since 2013. Oxalis Adventure has been collaborating with the British Cave and Research Association in maintaining safety and conservation. Below are the reasons why Son Doong Expedition cost US$3000:

    • In this $3,000 tour price, 10 percent of tax is already included, $660 is the environmental service fee that will be transferred to the management of the Phong Nha – Ke Bang National Park.
    • The fees also go to the 22 porters, five safety assistants, one international tour guide, a cave expert, two cooks and a forest ranger who accompany every 10 people who take a tour.
    • Other expenses include transportation, hotel, food and drinks, management and administration during the tour. (Not including international and domestic airfares).


Please visit our Son Doong Cave FAQ page to read our specific What to Bring list before departing for Vietnam and your cave expedition.


  • Use of 3 x 43,000 lumen LED filming lights
  • Camping gear: tent, sleeping mat, pillow and sleeping bag
  • Caving & safety gear: caving helmet, caving headlight, harness and gloves
  • Meals: breakfast (day 1, 2, 3, 4, departure day), lunch (day 1, 2, 3, 4), dinners (briefing day, day 1, 2, 3, 4)
  • Water filters (application by guide and porters)
  • Basic camping facilities with eco-friendly compost toilet using western toilet seat
  • First Aid Kit, Rescue Equipment & Satellite Phone (application by safety advisor and tour guides only)
  • 1 Safety advisor (member of the British Cave Research Association)
  • 1 Professional English-speaking tour guide, 5 safety assistants and 2 chefs
  • Porter team to carry all gear and prepare all meals
  • Accommodations (single or twin-shared) at Son Doong Bungalow before the tour and at Chay Lap Farmstay & Resort after the tour
  • Round-trip transfer Dong Hoi – Phong Nha before and after the tour


  • Trekking pants and shirts for 4 days
  • 1 – 2 pair of shorts and t-shirt to wear at campsite; warmer camp clothes suggested for colder months
  • 1 Fleece and 1 lightweight windproof/jacket (February – April only)
  • Trekking boots/shoes – difficult terrain, good footwear necessary
  • 4-5 pairs of calf length close weave socks
  • Flip flops/sandals, towel, wet wipes, water bottle, small head torch for camp
  • Re-hydration tablets, any required medication, anti-fungal foot powder, mosquito repellent, sunscreen and hat
  • Medium sized rucksack/backpack for daily belongings
  • Personal items (underwear, toiletries, medication, toiletries should also include feminine hygiene products for ladies, even if it’s “just in case”)
  • Phone, camera,...
  • Important Notes: We will have porters carry any of your gear that you will not require during each day (e.g. camera equipment/clothes you do not need during the day can be taken ahead to the campsite for you). You will not be able to access this until you reach the campsite. Please respect our porters and do not bring too much luggage for them to carry (7 kg per person). No outdoor equipment is available in Phong Nha, and only limited items in Hanoi or Saigon.
  • From 2019, all tours will benefit from extra photographic opportunities and equipment. Using our 38,000 lumen lights, we will enable you to take photographs only available previously on designated photography tours. We will light up the darkest parts of the cave to enable everyone, even iPhone users to create awesome images.


The following items are not required but highly recommended
  • Dry bag in the event of rain (for camera, clothing, and personal items within your daypack)
  • Gloves, as ours are one-size-fits-all (if you bring your own, please choose gloves with fingertips)
  • Cotton or silk sleeping bag liner
  • Swimwear (for Hang En)
  • If you are serious about photography, please remember to bring your tripod (this must be able to fit in your daypack)
  • Ear plugs (If you are a light sleeper)
  • Bandana to wear under the helmet, this will help to stop the helmet getting sweaty/smelly throughout the journey
  • Power bank/pack for your personal use.

Pricing and availability

Please choose your departure date using the calendar below to book your tour with us. The date shown on the calendar is the briefing day for your tour.

  • This tour is operated from Feb to the end of Aug (closed from Sep to Jan.)
  • The days in bold are still available
  • 2020 and 2021 tours are available for booking, please check calendar box belownew_releases
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