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This Jan. 23, 2013 photo provided by the diving excursion company DIVE.IS 

This Jan. 23, 2013 photo provided by the diving excursion company DIVE.IS shows snorkelers traversing Iceland’s Silfra, a rift fed by glacier water. Because of its pure water and stunning colors, Silfra has become a  popular site for divers despite near-freezing temperatures. (AP Photo/DIVE.IS, Louis Kotze)
Associated Press
This Jan. 23, 2013 photo provided by the diving excursion company DIVE.IS shows snorkelers traversing Iceland’s Silfra, a rift fed by glacier water. Because of its pure water and stunning colors, Silfra has become a popular site for divers despite near-freezing temperatures. (AP Photo/DIVE.IS, Louis Kotze)
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