Jean Gaumy

The sea ice is often thick and difficult to penetrate. Here, a team cuts a 2-square-meter hole in the ice.

In addition to collecting samples, divers anchor hydrophones under the ice to record the sound of small organisms and cracking ice.

Small holes in the ice are carved to allow the scientists to dive below.

Scientist test the water before diving in Daneborg, Greenland. Once submerged, they'll collect organisms living at the surface and harvest larvae, algae, and small crustaceans.