Onward: Searching for Life in Iceland's Frigid Fissures

In the cold waters of Iceland's Thingvellir National Park, National Geographic grantee Jónína Ólafsdóttir scours underwater fissures for tiny arthropods. The way they change and adapt may offer clues about what's in store for wildlife as the world's climate shifts.

Read about her work, and what it's like to dive in these frigid fissures:

Onward is a project to explore the world and share its untold stories. Hit the road with National Geographic multimedia journalists Spencer Millsap and Dan Stone at http://onward.nationalgeographic.com, or tweet them at @spono and @danenroute to join the conversation.