5 of 9Image
Under-ice divers Katrin Iken and Shawn Harper from the University of Alaska, Fairbanks, prepare for a SCUBA dive in the frigid waters of the Canada Basin.
Sea ice pressure ridge
Pictured is a sea ice pressure ridge as seen from a SCUBA diver's perspective during the Hidden Ocean expedition to the Canada Basin.
The team looked at microscopic organisms in the sea ice and sea water, as well as larger animals found in the water. Here, a jellyfish of the genus Crossota, collected from the deep Arctic Canada Basin with an ROV.