• Raufarhólshellir - This tour combines two of our classic experiences: The Lava Tunnel and Snorkeling the Silfra Fissure, offering the ultimate geological adventure day! Discover the lava tunnel and snorkel between tectonic plates in the pristine waters of Silfra. Enjoy both unforgettable activities with this value-packed combo.

Your adventure starts at The Lava Tunnel, where an expert guide will lead you through a vibrant underground world shaped by ancient volcanic eruptions. With all necessary safety equipment provided, you’ll marvel at colorful mineral deposits, striking rock formations, and learn about Iceland’s unique geology that formed this remarkable cave.

Then, proceed to Thingvellir National Park, a UNESCO World Heritage Site, home to the renowned Silfra Fissure. Here, you’ll snorkel between the North American and Eurasian plates in glacial meltwater, naturally filtered through lava fields for decades, offering unparalleled clarity with visibility of 100–150 meters.

You can meet us directly at each location or opt for the Reykjavík Transfer option for a hassle-free, car-free experience. We’ll take care of pick-up, transport between sites, and drop-off, allowing you to relax and enjoy the adventure.

• Silfra Fissure Snorkelling with Certified Divemaster
• Optional Reykjavík Transfer - Pickup & Dropoff
• Visit Thingvellir National Park, a UNESCO World Heritage Site
• All Necessary Caving & Snorkeling Gear
• Hot Chocolate + Cookies After Snorkeling
• Complimentary underwater photos taken by your guide

• Lunch not included. Guests may bring a packed lunch or purchase food at designated stops
• Please bring: Warm base layers, towel, change of clothes, thick socks

Embark on an unforgettable journey that combines two of Iceland’s most stunning experiences.

Start your adventure with an exhilarating exploration of Raufarhólshellir, one of Iceland’s longest and most famous lava tunnels. Situated just 45 minutes from Reykjavík, this remarkable underground passage captivates with its vibrant colors and intriguing rock formations, providing a unique insight into the core of a volcanic wonder.

Then, head to the Silfra Fissure in the UNESCO World Heritage-listed Þingvellir National Park. Dive into the crystal-clear waters for an unmatched snorkeling experience, where you’ll float between two continental plates in a surreal, otherworldly setting.

With a knowledgeable guide accompanying you, discover the secrets of Iceland’s geological marvels as you explore a captivating lava cave and immerse yourself in Silfra’s pristine, dreamlike underwater realm.

• Minimum age is 12 years old. Participants under 18 must be accompanied by a parent or adult guardian booked on the same tour.
• We recommend bringing warm outdoor clothing, packed lunch, thermal underwear, a change of clothing, towel, gloves, hat and good hiking shoes
• Snorkeling masks cannot accommodate glasses. If you do not have a prescription mask of your own, please arrange to use contact lenses
• Requirements: Weight limit: 45-120kg. Height limit: 150cm – 200cm. Must be able to swim.
• Guests must carefully review our Snorkeling in Silfra Handbook before the tour to ensure everyone can safely participate: https://adventures.is/media/240250/arctic-adventures-snorkeling-in-silfra-fissure-guide.pdf
• Pregnant women cannot participate in the snorkeling portion due to the risk of cold water entering the suit.
• Medical issues outlined in our handbook require doctors approval to join the tour. Some conditions mean guests cannot participate.
• Guests must have signed medical clearance from a doctor if you have any conditions outlined in the handbook (asthma, diabetes, high blood pressure, among others - see handbook)

For a full refund, cancel at least 24 hours before the scheduled departure time.