Hveragerði: Lava Tunnel & Silfra Snorkeling Self-Drive Combo Tour

This 5-hour self-drive combo tour takes you through two of Iceland's most extraordinary geological wonders in a single day. Beginning at the Raufarhólshellir Lava Tunnel, you'll descend into a volcanic tube formed over 5,000 years ago, marvelling at the vivid colours and intricate lava formations that reveal the raw power of Iceland's volcanic past.

Your second stop brings you to the Silfra Fissure inside Þingvellir National Park, a UNESCO World Heritage Site located approximately 45 minutes from Reykjavík. Here you'll snorkel directly between the separating North American and Eurasian tectonic plates — a geological experience found nowhere else on Earth.

The glacial water at Silfra originates from Langjökull glacier and is naturally filtered through lava fields over decades, producing some of the purest water on the planet with visibility of up to 150 metres. Your certified PADI divemaster guide will capture free underwater photos throughout the snorkel.

This is a meet-on-location tour: you drive yourself to each site and meet your expert guides directly at Raufarhólshellir and then at the Silfra car park in Þingvellir. All specialist equipment is provided for both activities, and hot chocolate and cookies are served after snorkeling.

This is a self-drive combo tour combining two separate guided activities at two locations. You drive yourself to each meeting point and join your guides on arrival.

• First stop — Raufarhólshellir Lava Tunnel: An expert caving guide leads you through one of Iceland's longest lava tubes. You'll see dramatic lava formations, learn about the volcanic processes that shaped the tunnel, and explore an underground world frozen in geological time. Specialist caving gear including helmet and headlight is provided.
• Second stop — Silfra Fissure, Þingvellir National Park: After driving to Þingvellir, your PADI-certified divemaster fits you with a dry suit and all snorkeling equipment before guiding you through the fissure. Water temperatures are cold year-round, but the dry suit keeps you warm. Your guide photographs the experience underwater at no extra charge.

After snorkeling, warm up with hot chocolate and cookies provided by your guide. Plan sufficient driving time between the two locations and check road conditions before you depart.

Few tours in Iceland combine underground and underwater adventure in a single day. This combo pairs the eerie beauty of a 5,000-year-old lava tube with the world-renowned clarity of Silfra — one of the top snorkeling destinations on the planet.

All specialist equipment for both activities is included, so there is nothing extra to organise. Þingvellir National Park admission is pre-included, meaning no separate payment is required at the gate. Free underwater photos and post-snorkel hot chocolate add genuine value without hidden extras.

Guides are English-speaking specialists: a certified PADI divemaster for Silfra and an expert caving guide for Raufarhólshellir, ensuring safety and insight at every step.