Geothermal forces set Iceland apart from most other destinations. Why not experience this phenomenon for yourself? Have you ever tried to dive into tectonic fissures? Because underwater exploration by diving into tectonic fissures known for their geothermal activity is a must!



Bjarnagjá and Kleifarvatn are the two dive sites you will explore on this day trip. Both offer interesting geothermal activities among other attractions. You too can dive in and among inverted waterfalls of bubbles rising from geothermal pockets below these fissures.

Air from below is forced through porous rock. Do not be startled or surprised if you feel slight vibrations coming from the surrounding rocks! It is completely safe and truly a once-in-a-lifetime experience. As a bonus, Bjarnagjá is proud to have an abandoned shipwreck and an old crab hatchery. During this tour, you can take a look inside.

  • Personal Experience
  • Trusted Tour Operator
  • Expert guides
  • Small group
Availability April - OCT
Duration 4/6 hours
Difficulty Demanding
Meet on Location Yes
Pick Up Yes
Minimum age 18 years
Group minimum 2 participants
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What's included


  • Pick-up and drop off in Reykjavik
  • Two guided dives with a certified PADI® Divemaster
  • All necessary dive equipment
  • All required safety equipment
  • English-speaking licensed adventure guide
  • Hot chocolate and cookies

What to bring

  • Proof of scuba certification and documented dry suit experience
  • Warm long underwear
  • Warm wool socks
  • A change of clothes
  • A towel

Not Included

  • Meals

Contact us for more Information about this tour



  • We begin our adventure at Kleifarvatn, a brooding lake known for its intense geothermal activity. The first signs are impossible to miss as the smell of sulfur greets us from the shore. We get our gear ready and dive in to discover where it's coming from. All around you, small bubbles rise from the ground, forming upside-down waterfalls.

  • As we approach a crater located in the middle of the lake, you will feel strong vibrations. Do not be alarmed. The pressure building up under the bottom of the lake is the reason for this strange and rare event. This experience alone makes a swim in Kleifarvatn an unforgettable one. 

  • Bjarnagjá is an 18-meter-deep lava canyon, a testimony to the tectonic activity in Iceland. You will experience it on your second dive. If you decide to dive there, you do not have to choose between freshwater and saltwater diving  you can do both! While most of the rift is filled with fresh groundwater, the ocean is only a few hundred feet away. Thus, the saltwater has a significant impact on the microclimate and helps to form a unique ecosystem. 
    A huge shipwreck lies quietly in this crevice. You will feel like you are on a real treasure hunt as you glide around it! Impressive underground caves and an ancient crab hatchery are two other attractions at Bjarnagjá. 


  • 8:30 am - pick-up in Reykjavik (10 am if meeting on-site).
  • 10:30 am - first dive (Kleifarvatn geothermal lake), followed by hot chocolate and cookies 12:00 pm - drive to Grindavik for lunch (lunch not included in tour price).
  • 13:00 - second dive (Bjarnagjá), followed by hot chocolate and cookies 14:30 - packing up and logging dives 16:00 - return to Reykjavik.
  • If you would like to be picked up from Reykjavik, we can arrange that. Choose one of our pick-up locations in Reykjavik and our car will be there at around 8:30 am (pick-up can take up to 30 minutes depending on how many people are on the tour).

  • If you prefer to take your own vehicle and meet us on site, details about the time and exact location will be provided closer to your tour date. Please arrive at least 15 minutes early to ensure there are no delays.


  • Open Water Diver certification (or higher).
  • Dry suit certification or a minimum of 10 logged dry suit dives.
  • At least one logged dry suit dive in the last two years.
  • Proof of certification or logbook (your guide will check the documents at the beginning of the tour).

All divers must provide their height/weight at the time of booking so that we can bring you the appropriate equipment. For safety reasons, all divers must understand the instructions in English and be able to communicate with the dive guide in English.
For more information about the tour, please visit our Diving Handbook.

Age limit: At least 18 years old 
Weight limit: 50-120 kg 
Height limit: 155-200 cm

  • We use neoprene dry suits of the highest quality. However, no dry suit in the world can guarantee 100% waterproofness unless it is custom-made for you. There is a small chance that water will penetrate the suit. Please bring a spare set of clothes and a towel, just in case.

  • Remember this is a physically demanding dive and you must be able to walk approximately 200m with your equipment.