Reykjavík: Silfra Fissure Snorkeling and Lava Caving Tour

This Reykjavik-based tour promises a day of underground adventures—two of Iceland’s most unique natural phenomena. You’ll start by exploring the dark, colorful tunnels of a lava cave, then swap the darkness for daylight as you snorkel in the famously clear waters of Silfra. The experience is well-loved, with a solid 4.7 rating from 176 reviews, thanks to guides, scenery, and a sense of adventure that’s hard to match.

What I particularly like about this experience is how seamlessly it combines two different worlds—volcanic tunnels and submerged tectonic plate fissures—giving you an authentic taste of Iceland’s volcanic activity. The guides, especially Weronika and John, earn praise for their passion and patience. Plus, the free underwater photos are a thoughtful bonus, letting you relive the moment without extra cost.

One thing to keep in mind is the length of the entire tour—ranging from 5 to 9 hours—so it’s a full day’s commitment. It involves some driving, waiting, and outdoor exposure, so dressing in layers and bringing a change of clothes is essential. If you’re not comfortable in water or have mobility or medical concerns, this adventure isn’t suitable, but for thrill-seekers or geology lovers, it offers a rare, hands-on peek into Iceland’s volcanic heart.

Key points / Takeaways

• Unique underground landscapes: Lava caves and fissures shaped by volcanic activity provide an immersive look into Iceland’s fiery past.
• Expert guides: Guides like Weronika and John are praised for their energy, patience, and knowledge, making the experience both safe and engaging.
• Crystal-clear waters: Silfra offers some of the purest water you’ll ever snorkel in, with stunning shades of blue that seem otherworldly.
• Comprehensive gear setup: All necessary equipment—including dry suits and caving gear—is included, ensuring comfort and safety in icy waters.
• Photo souvenirs: Underwater photos are taken free of charge, helping you cherish the memories long after the tour ends.
• Flexible but full day: With up to 9 hours, the tour packs a lot but requires good planning—arrive early, especially for each activity.

When planning a trip to Iceland, the chance to see both lava tunnels and the Silfra fissure in a single day is pretty special. This tour from Arctic Adventures offers a well-rounded peek into the volcanic core of this land—an island shaped by fire and ice.

The Lava Caves: A Tactile Journey into Icelandic Volcanoes

The adventure begins with a trip to Raufarholshellir Lava Tunnel, about 15 minutes outside Reykjavik. As you enter this underground world, you’ll marvel at the volcanic formations that have been slowly shaped over thousands of years. Your guide, known for their enthusiasm and expertise, will explain how these tunnels are formed by flowing lava cooling and hardening on the outside while still molten inside.

Many reviewers speak highly of the lava caves, describing them as “absolutely breathtaking” and “beautifully interesting.” Guiding staff is praised for their friendliness, humor, and deep knowledge—creating a relaxed yet informative atmosphere. Some say this part of the tour feels like a quiet, contemplative experience, perfect for geology buffs or anyone curious about Iceland’s volcanic activity.

Transitioning from Darkness to Light

After exploring the tunnels, you’ll take a break—possibly at a local bakery, a thoughtful touch by the guides—before heading to Thingvellir National Park. Here, the landscape shifts from underground tunnels to an open, scenic area where tectonic plates drift apart, creating the fissure known as Silfra.

Snorkeling in Silfra: An Otherworldly Experience

Silfra is renowned for its crystal-clear water, which allows visibility of up to 100 meters in some spots. The water is filtered through lava rock, giving it a striking blue hue that makes it seem like you’re floating in an alien landscape. You’ll glide between the North American and Eurasian plates, a geological phenomenon that’s impossible to see anywhere else.

Guided by a PADI-certified professional, you’ll don dry suits and snorkel gear, floating gently in the water’s current. Many reviewers mention how surprisingly warm they felt thanks to the dry suits, with one saying, “the water wasn’t even as cold as I thought.” Guides like Nebo and Taz are especially appreciated for their patience and safety awareness.

What to Expect During the Snorkel

Expect to spend about an hour in Silfra, with instructions and assistance every step of the way. You don’t need to be an expert swimmer—buoyancy is handled by the dry suits, and guides keep a close eye on everyone. For first-timers, the experience of weightlessness and vivid blue surroundings can feel surreal.

Post-snorkel, you’re treated to hot cocoa and biscuits, which is perfect for warming up after your icy dip. Many reviewers mention how this thoughtful detail makes a big difference, giving everyone a chance to relax and reflect on the moment.

This experience is priced at around $202 per person, which includes all gear, park entrance fees, and guiding services. The value here lies in the combination of two unforgettable adventures—lava caving and snorkeling—both in remote, pristine environments. Plus, the inclusion of free underwater photos and the convenience of hotel pickup (if chosen) add to the appeal.

The tour is designed for people who are comfortable in water and able to swim but is not suitable for pregnant women, children under 12, or those with mobility or medical issues. Be aware that the tour involves outdoor travel, some walking, and immersion in cold water, so proper layering, waterproof clothing, and a change of clothes are essential.

Given the length and physical aspects, this tour suits adventurous travelers who want a full-day, active experience. It’s especially appealing for geology enthusiasts, nature lovers, or anyone interested in seeing Iceland’s volcanic origins firsthand.

The Benefits of Guided Tours

The reviews consistently highlight how guides elevate the experience through their enthusiasm, expertise, and safety consciousness. Many mention guides like Weronika and John for their patience and ability to make everyone comfortable, even in challenging conditions. Their knowledge turns what could be a simple activity into a genuine learning experience.

The Scenic and Cultural Value

Beyond the activities, the drive between sites offers glimpses of Iceland’s stunning landscape, from lava fields to lakes. The local bakeries and stops provide taste of Icelandic hospitality and cuisine, adding a cultural dimension to the day.

For travelers craving a mix of adventure, geology, and stunning scenery, this combined lava cave and Silfra snorkeling tour offers excellent value. It’s a full-day immersion into Iceland’s volcanic soul, with enough variety to keep even the most energetic happy.

While it’s not for everyone—those with medical concerns, water fears, or mobility issues should look elsewhere—the majority of active, curious visitors will find this tour unforgettable. The guides’ professionalism, the incredible landscapes, and the chance to float between continents make it a truly unique experience.

If you’re seeking an unforgettable day in Iceland that combines underground mysteries with the chance to see the world from a different perspective, this tour is a fantastic choice. Just remember to dress warmly, listen to your guides, and enjoy the wild, volcanic magic that Iceland is famous for.

Is hotel pickup included?
Yes, if you select the optional pickup, your guide will pick you up from designated Reykjavik locations.

What should I bring?
Bring warm clothing, a change of clothes, and a towel. Since you’ll be in cold water, layering is key.

Is this tour suitable for children?
No, it’s recommended for ages 12 and up due to water safety and physical requirements.

Can I participate if I’m not a good swimmer?
Most participants aren’t expert swimmers; dry suits help with buoyancy, and guides are always close by.

How long does the entire tour last?
From 5 to 9 hours, depending on the schedule and group pace. Expect some driving, waiting, and outdoor time.

Do I get photos?
Yes, guides take free underwater photos during the snorkeling, so you can focus on enjoying the scenery.

What’s the biggest challenge of the tour?
Possibly the cold water—though the dry suits do a great job—and the outdoor conditions, so dress accordingly.

Is this experience worth the price?
Absolutely, especially considering the quality of guides, the inclusiveness, and the uniqueness of both activities. It’s a memorable introduction to Iceland’s volcanic landscape.

Whether you’re a geology nerd or an adventure lover, this combined lava caving and snorkeling tour offers a rare glimpse into Iceland’s fiery core—and a day you’ll remember long after you leave.