Divers Search for Tiny Animals in Iceland’s Fissures

The water in Iceland’s groundwater fissures “is basically the same water we’re drinking from the tap,” says Jónína Ólafsdóttir, a freshwater biologist who’s been scuba diving in the cracks in the Earth’s crust for years. “I can take my regulator out at any time during the dive and take a sip if I’m thirsty.” The water isn’t just clean—it’s also remarkably clear. If it weren’t for the bubbles, Ólafsdóttir might appear to be suspended in thin air while diving. “I’ve never seen this kind of visibility anywhere else I’ve been diving in the world,” she says.

The water column appears devoid of life. Yet tiny animals surround Ólafsdóttir and her team. They’re conducting an unprecedented survey of the fissures’ ecosystem, including the thousands of invertebrates that live in the algae mats and caves within them.

During their project, which was funded in part by a grant from the National Geographic Society, Ólafsdóttir and her team explored about a dozen fissures and discovered a copepod species, Eucyclops borealis, that had never been documented before in Iceland.

Their biggest surprise was coming across an unusual fissure that wasn’t exposed to open air or sunlight. “I didn’t expect anything like that underground fissure to be there,” says Ólafsdóttir. She brought samples from the cave back to the lab and found animals that were very meticulously adapted to their environment. “[The cave-adapted animals] are living in complete darkness, in freezing water, with very little to eat. But despite that, they’re thriving. They have no pigment, and they are blind. They are kind of a model for the power of evolution.”

Ólafsdóttir explains that when it comes to researching such tiny animals, it’s often a long time before you realize that you’ve made a discovery. While it’s instantly gratifying to discover an underground fissure, for example, or to complete a very challenging dive in a cave, the post-expedition work in the lab can be a slow process. “It’s funny,” she laughs, “the scientific analysis of the invertebrates—it creeps up on you.”

Ólafsdóttir is thankful she gets to work in such a beautiful and unique place. “The reason I wanted to learn to dive was because I wanted to see different areas and species that you can’t access very easily. I have a team of both very, very good divers as well as biologists working together, so I have the best of both worlds.”

Find out more about Ólafsdóttir’s work by checking out this article and video by National Geographic reporters who dove with her in Iceland. Or listen to an interview with Ólafsdóttir on National Geographic’s radio show:

Carolyn Barnwell has been a producer on the Science and Exploration Media team at National Geographic for over five years. She creates content to support the non-profit National Geographic Society including impact initiatives and the important work of explorers and grantees around the globe. She wrote, produced and edited for Nat Geo’s first-ever web series focused on explorers in the field: Expedition Raw and Best Job Ever. She loves yin yoga, wildlife encounters, and eating baked goods while they are still warm from the oven.
  • Bonnie tabbert

    That is so Amazing to find the beginnings of life – I envy all of you for the opportunity of a lifetime to witness the beginning of life keep doing your great work and let us know how it happens and what will come of it Thank You

  • bridget halpin

    this was so interesting would love to see more thank you for sharing it .

  • moosa

    از این که دارین به علم خدمت میکنین قابل ستایشه

  • Jane

    i would realy like to find out what she has found and the rest of this video.can some one tell me were? Love all the study behind the videos..thank you so much

  • abdul rehman

    nice post and plz approve my…….

  • Cem Demir

    I’d love to all of these documentary. I’ve been watching your every documentary interest.


  • sundar sarma

    amazing nobody will belive this true things

  • silvio ferrare

    Muito legal mesmo suas historias.

  • jamil jan

    good and amazing movies.

About the Blog

Researchers, conservationists, and others share stories, insights and ideas about Our Changing Planet, Wildlife & Wild Spaces, and The Human Journey. More than 50,000 comments have been added to 10,000 posts. Explore the list alongside to dive deeper into some of the most popular categories of the National Geographic Society’s conversation platform Voices.

Opinions are those of the blogger and/or the blogger’s organization, and not necessarily those of the National Geographic Society. Posters of blogs and comments are required to observe National Geographic’s community rules and other terms of service.

Voices director: David Braun (dbraun@ngs.org)

Social Media