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About Tour

A one-of-a-kind underground cave adventure! Explore the depths of a lava tube then go snorkeling in between the North American and Eurasion tectonic plates. Walk and then float over lava and swim between large volcanic canyons.


4 reviews


  • Small Group Experience
  • Silfra Fissure
  • Þingvellir (Thingvellir National Park)
  • Snorkeling Tour
  • Caving Tour
  • Free snorkeling photos

Spend the whole day beneath the surface with our expert guides! Prepare for an adventure deep into the beating heart of Iceland.

Snorkeling in Silfra Fissure Iceland - March 2016 (HD)

On this tour, we'll visit an ancient underground lava tube cave where we'll see awe-inspiring rock formations in varied shapes and colors. Afterward, we'll drive to Thingvellir National Park for an afternoon of snorkeling between the Eurasian and American tectonic plates.

Snorkeling at Silfra Fissure has been rated one of the top 5 activities in the world by Trip Advisor!

Availability All Year
Duration 6 / 9 hours
Departs From Reykjavik / Raufarhólshellir
Level Moderate
Minimum age 12 years
Meet on Location Yes
Pick Up Yes


Per Adult
    • Silfra Snorkeling - Top 5 activity in the world by Trip Advisor!
    • Expert Guides
    • Small Group Experience
    • Free Wifi
    • No Booking Fees
    • Free Cancellation

Please Select When Booking:

You have selected Meet on location
You have selected From Reykjavik

What's included


  • Certified PADI Dive guide / Divemaster
  • English Speaking Tour Guide
  • An Expert Caving Guide
  • All Necessary Snorkeling & Caving Gear
  • All Necessary Safety Equipment
  • Silfra Admission Fee
  • Hot Chocolate & Cookies
  • Free snorkeling photos taken by your guide

What to bring

  • Warm and waterproof outdoor clothing
  • Gloves
  • Warm long underwear (fleece/wool)
  • Warm socks
  • Change of clothing

Not Included

  • Meals

Contact us for more Information about this tour



This Iceland snorkeling and caving tour gives you an opportunity to experience the country from a new angle.

We start with the black part of the tour by exploring a lava tube cave close to Reykjavík. We’ll head to Raufarhólshellir, one of the longest lava tube caves in Iceland. This adventure gives you great insight into the volcanic activities that have formed the country.

After we finish caving, you will have a chance to grab some lunch between the two activities.

Next, we’ll meet you at Þingvellir National Park, where Silfra fissure is found. Here we get ready to explore the blue. Witness some of the clearest water on Earth as your guide leads you on an underwater journey. 

Raufarholshellir lava tube tunnel in Iceland

Raufarhólshellir is a geological paradise renowned for its stunning minerals. A palace of colorful stalagmites and stalactites, this underground cave shows the fiery side of the land of fire and ice. 

The longest lava cave in Iceland, Raufarhólshellir spans 1360 meters long. No need to worry about crawling through tight spaces - the ceiling of this vast tunnel reaches 10 meters high. 

Lava tube caves are formed by a flash cooling process of lava that flows deep below the Earth’s surface. Formed over 5000 years ago by the Leitahraun eruption, Raufarhólshellir is an ancient relic of a long-lost volcano.  

During the Raufarholshellir tour you’ll witness where time stands still. Marvel at the main tunnel ceiling where three stunning light beams shine, then continue to three small tunnels decorated with frozen lava. These spectacular rock formations are one of the best sights in Iceland. 

Thingvellir is one of Iceland's most famous national parks. A UNESCO world heritage site, it is a historic landmark and geological wonder. Step foot back in time at the site where the first parliament (Alþingi) was founded in 930. Today visitors can still find archeological relics such as the Lögberg or Law Rock and ruins of stone shelters. 

Perhaps its most remarkable feature, the park sits on a rift caused by the separation of two continental plates. Within the valley are rocky cliffs and fissures such as the awe-inspiring Silfra fissure. World-renowned as a dive and snorkel site, here we embark on our underwater adventure. 

snorkeling tour in Silfra fissure

Snorkeling Silfra is a rare experience. Located between the Eurasian and North American tectonic plates, it is the only place in the world where you can swim between continents. 

Dubbed as the clearest waters on Earth, the visibility at Silfra reaches close to 150 meters for unparalleled views. Stare into the depths of the ocean in a way you never have before. 

Your guide will accompany you as you drift through the peaceful waters. You'll soon see why this experience has been called liquid meditation. Along the way, you'll explore the underwater geology under these glacial waters. 

Touch lava rocks and observe Iceland from a different angle. This one-of-a-kind adventure requires no previous snorkeling experience and is sure to captivate all ages. By the end of our trip, you'll understand why Silfra fissure snorkeling tours were rated as one of the Top 5 activities in the world by TripAdvisor.

Participants need to be comfortable in the water and be able to swim. You are unable to participate if you are pregnant, due to the small risk of cold water entering the suit.

Medical condition: Please fill in the medical statement form in our Snorkeling Handbook before booking the tour. If you have any medical issues you will need to get medical approval from a doctor.
Weight limit: 45-120 kg
Height limit: 150 cm -200 cm
Age Limit: 12 years old minimum. Guardian's approval is needed for minors under 18.


All relevant information for the tour can be found in our snorkeling handbook.

Yes, you can bring a camera, but we recommend to have a waterproof one if you want to have it in the water with you.

If you plan to drive and meet us on location, the meeting point is at the Silfra car park, in Thingvellir National Park.

GPS: 64°15’23.508″N 21°6’58.676″W

Note that the National Park charges a small parking fee of 500 ISK.

We kindly ask you to be at the Silfra car park 15 Minutes prior to your tour starts.

No. Unfortunately, glasses don’t create a seal between your face and the mask. We recommend wearing contact lenses instead.

You are not able to participate in the snorkelling tour if you are pregnant.

Yes, the tour is directed in English and therefore you need to be able to understand English to participate.

Some snorkelling tours match with a dive tour, and then you will be in the same area at the same time. You will, however, be in separate groups with separate guides, and won’t be in the water exactly at the same time.

You need to be more than 12 years old. Participants under the age of 18 must be accompanied by a parent or adult guardian booked on the same tour.

You need to know how to swim independently. Because of the drysuit sizes, there are height-weight limitations. The minimum height is 150 cm, and the minimum weight is 45 kg. The maximum height is 200 cm, and the maximum weight is 120 kg.

All participants must have read and followed directions in the Snorkeling in Silfra Handbook.

The minimum height is:
  • 150 cm (4’9)
The minimum weight is:
  • 45 kg (99 lbs)

The maximum height is:
  • 200 cm (6’5)
The maximum weight is:
  • 120 kg (265 lbs)

Yes, you must be able to swim independently without a lifejacket, and you must be comfortable in the water.

When snorkelling in Iceland you will be wearing a dry suit, hood and gloves made of neoprene, along with fins, mask and snorkel. This equipment will make it not only possible but also very enjoyable, to stay in the water despite the low temperature. It is a fantastic experience.

No, you don’t need any previous experience to snorkel, but it is important that you can swim independently and that you are comfortable in the water.

Please wear or bring some long underwear and some warm socks. Wool or fleece is the best material to wear. You will be wearing your long underwear and warm socks under the dry suit.

We provide dry suits so that your body stays dry, and you will also wear undergarments to keep you warm. We use high-quality neoprene dry suits from Waterproof International and O´Three. But it is good to know that there is always a small risk that water can enter the dry suit. This is not dangerous but can feel a little cold, so we recommend you bring a spare set of clothes and a towel, just in case. Kindly note that your hands and face will get wet, which is completely normal and not actually that cold.

We provide an undergarment and neoprene dry suit from Waterproof and 0’Three. We also provide a neoprene hood and neoprene wet gloves to protect your head and hands from the cold. You will also be given fins, mask and snorkel.

Our client to guide ratio is one guide for every 6 snorkelers.

The water temperature is 2-4 degrees C (35-37 degrees F) all year round. The water comes from the Langjökull glacier which keeps it nice and cool, and very refreshing!

We use high quality neoprene dry suits from Waterproof International and O´Three.

Yes, there are 2 toilet facilities at Silfra. However, we don’t recommend that you use them for changing, as it can result in long queues.

Sometimes fish venture into Silfra from Þingvallavatn lake, but they will quickly swim back, as they don’t like chilly glacier waters. However, there is plenty of colorful seaweed, including a bright green variety known as “troll hair”, which makes the fissure unlike anything on the surface.

The cave systems in Silfra can be up to 60 m deep. However, your dive in Silfra will be from about 7 to 12 m, and the maximum diving depth that is permitted is 18 m.


Based on 4 reviews

Black & Blue - Caving & Snorkeling Tour

1- of 4 reviews

Black and Blue tour

Reviewed on February 13, 2022 by T3rri_B Review from TripAdvisor

Pick up was from BSI bus terminal and a not unreasonable time of 8am. Bear in mind that they allow half an hour for pick up but there’s somewhere warm to stay and look out from.

It’s a small bus for about 20 people and you drive to the lava tunnel first. They give you a hat with a torch and crampons to wear. It’s not too slippery and there were all levels of people doing it, so don’t be afraid.

They only take you into the tunnel a short while on this tour but you get to a part where there is no day light access and they offer the opportunity to show you what complete darkness looks like. You can say no, don’t be afraid to. But it is an experience like no other so if you can, give it a try.

You stop for lunch at a cafe. Lovely coffee and breads and soups. Reasonable prices but you can bring your own lunch.

Then the trip up to the silfra in Þingvellir national park. Absolutely stunning.
You strip down to your base layers and socks, They give you a down suit (which is super super warm) and then the wet suit over the top. (That’s fun to get on...)
Then they give you a hood/gloves and put elastic bands around your wrists and a ‘choker’ over your neck, to make sure you stay dry!
It could leak but it’s very very unlikely.

Then you walk with your flippers and mask down to the water platform and wait to go in. They put on your flippers for you and you waddle down the steps into 2 degrees water.
The suit compresses a little so you feel snug and this helps keep you warm.
The gloves let water in so try to keep your hands still and behind you like they tell you.
The water is very cool on your lips and will make them swell temporarily. After a few moments the feeling subsides and all you care about it the stunning crystal clear water you’re drifting easily through.

You don’t need to be the best swimmer but give them a heads up if you’re a little apprehensive.
There is a very small lazy river type current but otherwise it’s just a glacial pond essentially. Clean enough to drink but I wouldn’t recommend it.

Our guide was Nebo. He was hilarious and didn’t get fed up with the many questions, moanings of cold or asking ‘can you tuck this bit of hair away for me’

Remember the suit is not meant to be glamorous but it’s the one thing keeping you from jumping straight back out or sinking!

Plus after half an hour of snorkelling (it doesn’t feel like that long at all) you get hit chocolate and biscuits! What could go wrong?

Ps. You can buy the pictures they take after but I think it’s cheaper to buy online ahead of the day. They’re downloaded online, they give you the details after.

Reviewed on February 06, 2020 by Fiona Murray From our post-trip system

The lava tube tour was really interesting and well worth a visit. The silfra fissure was lovely although there was a bit of chaos when allocating people into groups which resulted in wasting a lot of time standing around (I had to go through 2 briefing sessions) before our turn to go snorkelling. I would probably try and do an early morning tour next time to beat the crowds. On the other hand, limiting groups to a maximum of 6 is really good as once you are in the water it doesn't seem so crowded.

Into the wild blue yonder!

Reviewed on January 22, 2020 by Wayne Myers From our post-trip system

The experience of walking thru a lava tube is amazing, especially in winter. You get to see the sun slowly rising as you gaze up thru the surface holes that pocket the cave. The ice forms amazing patterns on the ceilings, walls and floor. Snow drifts into the cave are rare but also have some fun shapes as well. The snorkeling was the best. The main color is blue but they have many other shades of lavender and yellow depending on the sun. And they green from the grass growing on the sea floor. It was cold but not unbearable. As you float on the surface you get a view that looks like you can just reach out to the sea bed but is actually 100 meters below!

Black and Blue Tour

Reviewed on August 13, 2019 by Kate B From our post-trip system

We had an awesome time on the Black and Blue Tour. Yanis and Tom were our respective guides. They were engaging, knowledgeable, safe and very fun! We’d highly recommend this tour.