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Black & Blue - Caving & Snorkeling Tour

Snorkeling & Lava Caves in Iceland at Silfra Fissure

A one-of-a-kind underground adventure! Explore a lava cave then go snorkeling in Thingvellir National Park.

Caving Snorkeling
5.0 rating based on 11 ratings

Want to do this trip for free? Tag us @arcticadventures on your social media stories and photos during your trip and enter a chance to win a full refund. The winner will be picked once a month!

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

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!

Read our Snorkeling in Silfra Handbook for how to prepare for your adventure.

  • Availability

    All year

  • Duration

    9 hours

  • Duration Overwrite

  • Level


  • Pickup


  • Meet on location


  • Min. Age

    12 years

  • Departs from


  • Departs from Overwrite

  • Price from

    24.990 ISK

Tour highlights
Small Group Experience
Silfra Fissure
Þingvellir (Thingvellir National Park)
Snorkeling Tour
Caving Tour
Pick-up & drop off from Reykjavík
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 WiFi on Board Your Bus

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

After we pick you up from Reykjavík, 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 drive to 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 Cave Tour

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. 

Þingvellir (Thingvellir)

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. 

Silfra Fissure Snorkeling

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.

Pick-up Information

Pick up: For those who have chosen to be picked up in Reykjavík, the pick-up time is at 08:00 am. Picking everyone up can take up to 30 minutes, your patience is greatly appreciated!
Available pick-up points: Arctic Adventures’s pick-up list.

Practical Information

Remember to bring: Warm and waterproof outdoor clothing, gloves, warm long underwear (fleece/wool), warm socks, a change of clothing (just in case).

What if I don’t own all of these clothing necessaries?
Don’t worry, you can always rent sturdy hiking shoes, waterproof jacket and pants in the booking process. We do not rent gear from location.


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.

Weight limit: 45-120 kg
Height limit: 150 cm -200 cm
Age Limit: 12 years old minimum. Guardian’s approval needed for minors under 18.

Please note

Due to guide/customer ratio limitations and Þingvellir National Park regulations this tour sells out frequently, we recommend you book this tour well in advance.

We recommend bringing gloves to wear inside the cave as it can sometimes get a little cold.

How is it best to be ready for a pick-up for a tour with Arctic Adventures?

This is a great question. We ask all participants to be ready from the start of the pickup time indicated. This is because you may well be the first pick up of the day. Please be at your assigned location at the start time that you chose when booking the tour.

Here you should wait for your guide.

Have your email and phone number listed with us so we can contact you if we run into any trouble finding you.

View our pick-up locations in Reykjavík.

Can I drink alcohol before or during Arctic Adventures tours?

Before and during activities on the multi-day tours consumption of alcohol is prohibited. If we suspect that a participant is intoxicated, we will prohibit them from joining the activity.

After the activities of the day are finished, you are welcome to have a drink and relax.

Do you offer any family friendly tours, for younger children?

Yes, we do. Langjökull Ice Cave is a magical experience, the tour has no minimum age and is a wonderful option for the whole family. Whale Watching with our partner company Elding has been a favourite with families traveling with young children, these guys have a great success rate in seeing whales (upwards of 98% in the summertime).

Another option would be the Landmannalaugar Safari on this tour you get to explore parts of the Icelandic highlands and bathe in natural hot springs. Most of our jeep tours are also suitable for children over the age of 6 years old. If you would like a nice and relaxing experience we would also recommend the Golden Circle & Secret Lagoon tour.

Can the itinerary for the tour change?

Your safety is our number one priority! Keeping this in mind, Arctic Adventures reserves the right to adjust the itinerary and/or take different routes depending on conditions. Please read more information in our cancellation policy.

Is there a guide on each Arctic Adventures tour?

Yes, there is a specially trained and certified guide on each of our tours. The only exception to this is for our self-drive tours.

All of our tours are guided in English.

Can the guide advise if I am eligible for rescheduling the tour and/or a refund?

No, for all your questions and concerns you would need to contact our customer service.

What type of power outlets are used in Iceland? Do I need to bring an adapter?

The standard in Iceland is 230V and 50Hz and we use F-type power sockets and plugs, so you might have to bring an adaptor if you are visiting from UK, USA, Canada or other countries using a different voltage, Hz or plugs.

How are the tours rated in terms of difficulty?

Our tours are split into four different categories that help participants to understand what to expect from the tour. The categories are Easy, Moderate, Challenging and Demanding. Each tour is rated making it easier to find tours that suit you.

For further information about the difficulty ratings and descriptions.


How does carbon offsetting work?

We’ve partnered with the Kolviður Fund in a new carbon offsetting program, which passengers can select to participate in at the time of booking.

The Kolviður Fund is the oldest, most respected carbon offsetting program in Iceland. With your support, one tree will be planted in special Kolviður forests in Iceland to carbon offset your tour with us.

Kolviður forests are strategically planted to absorb the maximum amount of CO2 and the forests are protected for a minimum of 60 years. During their lifetime the trees absorb carbon and store it in their root system, trunk, and branches. Trees also prevent soil erosion and maintain storage of carbon in the soil.

What equipment do you provide for the lava tube caving trip?

We provide you with a headlight and a helmet.

What should I wear on a lava caving tour in Iceland?

Like always in Iceland, it’s best to dress in layers. Warm layers closest to you preferably wool/thermal underwear, pants sweater and on top waterproof outdoor clothing. We also recommend that you wear good hiking boots and gloves. Jeans have proven to be a bad choice.

What is the best way to prepare for the tour?

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

Can I bring my camera on my snorkeling tour?

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.

Where is the meeting point for the snorkeling tours at Þingvellir?

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.

Do you offer photos from the snorkeling tour?

Our guides normally have an underwater camera and usually, take photos during the tour. If you are interested in photos please let your guide know before you go into the water.

You can then buy the photos from your guide at the end of the tour, for a price of 2990 ISK, which includes all the photos from that day. Kindly note that photos cannot be guaranteed. Our customer’s safety and wellbeing is our first priority, and therefore the guide will focus on snorkelers as a priority when in the water and will be taking photos when everyone is comfortable.

Can I wear glasses during the snorkeling?

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

I am pregnant, can I participate in the snorkeling tour?

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

Do I need to be able to understand and communicate in English in order to participate in the tour?

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

Can we do snorkeling and diving at the same time?

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.

What are the requirements for snorkeling in Silfra?

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 dry suit 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)
Do I need to know how to swim?

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

What is snorkelling in Iceland like?

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.

Do I need previous experience to snorkel?

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.

What clothing should I wear?

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.

Will I stay dry in the water?

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.

What equipment do you provide?

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.

How many snorkelers will be on each tour?

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

What is the temperature in Silfra Fissure?

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!

What kind of dry suits do you provide?

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

Are there toilet facilities in Silfra?

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.

Is there any life in Silfra?

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.

How deep is Silfra fissure?

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.

Book this tour

Price from: 24.990 ISK


If you are staying downtown Reykjavik please read this information about pickup.

Black & Blue - Caving & Snorkeling Tour | Average rating: 5/5 based on 11 customer reviews

"Black and Blue Tour" | 5 stars By Kate B 13/08/2019
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.
"Great experience!" | 5 stars By Christly 05/06/2019
We started off at the lava fields in Grindavík and were in the tubes exploring for about an hour. It wasn’t that cold in the tubes, luckily, but above ground it was extremely windy and cold. On the way out, we were given the option to crawl using an alternate pathway or to return the same way we entered. I opted to crawl and it was quite an experience. It narrows down to ~80cm but crawling through was pretty fun. After that, we stopped for lunch at Thingvellir and then headed to Silfra to get our drysuits on. The fissure was a beautiful deep blue and you can even drink the water that gets into your snorkel. I stayed completely warm and dry in the suit although some people got wet. Cookies and hot chocolate after to warm up we’re satisfying. Overall, great experience. I recommend!
"Black and Blue" | 5 stars By Tom 12/05/2018
All parts of the tour were professionally administered starting with a timely pick-up. We only had 4 other guests on the tour which made it very comfortable. The guide communicated well as to what we doing at each step of the tour. Even though the weather was stormy throughout the day, we had a great time and enjoyed every minute.
"Black and Blue Snorkeling and Lava Cave Tour" | 5 stars By Nicole Roscow 01/06/2018
Excellent tour. The guide was on time picking us up from our hotel and took us to the lava cave where he explained how the caves are formed, some of the history of the cave, and pointed out the unique formations. The snorkeling portion was also amazing with incredibly clear water and beautiful colors underwater. I was nervous about being cold in the water but the dry suits kept me dry and decently warm! I wasn’t uncomfortable at all and the views were great. The guides and other people on our tour were also great, conversational and fun to be around. This is also something you can’t do without a tour guide so I definitely recommend it to experience even more of Iceland! Thanks Arctic Adventures!
"Incredible Tour!" | 5 stars By Jeana Beilstein 04/02/2018
I'd highly recommend this tour if you're in Iceland. It's truly breathtaking and worth the money! Brave the cold - you won't regret it! The tour guide were timely and super nice!
"Good time!" | 5 stars By Laurent LD 22/02/2018
We had a wonderfull tour with Thomas as great guide very helpfull and friendly. Getting down to the cave was athletic but unforgettable. As well the snorkelling. I recommend!
"Great Adventure" | 5 stars By Michelle 22/02/2018
One of our best snorkeling trips! It was a beautiful sunny day and the scene was incredible with snow on the stream bank. Take an underwater camera, the photo opportunities were numerous. Friends thought we were crazy snorkeling in Feb, but with the water and air being about the same temp, it was perfect. My only recommendation would be to bring a small foam pad to stand on while waiting to go down to the water, so not standing on the snow and ice.
"Amazing tour!" | 5 stars By Laura M 18/03/2018
We originally only had the snorkelling tour booked but were upgraded to the Black & Blue tour for an unexpected reason. We couldn’t be happier that we were! The caving experience was awesome! Added some extra adventure to our tour. The snorkelling tour was absolutely amazing! Our guide Andrea was awesome too. Very friendly and funny and we learned a lot from her. I would highly recommend this tour!!
"Black and Blue" | 5 stars By Fiona O'Neill 25/02/2018
This was one of the highlights of our week in Iceland, what an unforgettable day! Micah and Ronan were knowledgeable and very friendly. Some points - when we arrived at the lava tube, there were 2 other couples as well as us who didn't realise what this entailed - we all thought it would be walking through more cavernous spaces rather than crawling etc. It was a fantastic morning which we thoroughly enjoyed but more info beforehand would be beneficial. Also, overalls would be appreciated for going through the tighter spaces, so as not to rip clothing etc. Thanks again to the wonderful guides.
"By far the highlight of our trip!!!" | 5 stars By Ainsley Browne & Nerida Casey 14/03/2018
By far the highlight of our trip!!! Becca, our guide was fantastic. Friendly, informative and knowledgeable. Chris, our guide for the snorkeling was amazing, very comforting as we went went out of a comfort zone for this fantastic experience. We would, and have highly recommended this tour with Arctic Adventures.
"This experience was wonderful! " | 5 stars By Jade 28/04/2018
This experience was wonderful! Our guide was very informative and answered all of our questions and gave us great information. The lava caving was super cool and we had extra time before the snorkeling, so our guide took us to Thingvellir National Park to see a waterfall. The snorkeling was amazing and definitely nothing like I have done before. Our guide made us feel comfortable and made the experience so worthwhile. They treated us to hot chocolate and cookies after to top it off and keep us warm!
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