Diving Beneath the Ice

Divers deep into the cold waters beneath the ice.
(E. Kristof, NGS, Arctic Exploration 2002, NOAA)

The world beneath the Arctic ice is magical, but cold. Divers have to tolerate temperatures of 30 degrees Fahrenheit (about -2° Celsius.) To stay warm they wear thermal undergarments and use special gear called dry suits. Sunlight filters through the ice layer bathing the underwater habitats in shades of blue. Because the water is so clear, visibility can extend for hundreds of feet.