In this Saturday, March 21, 2009 photo released by the U.S. Navy, the Los Angeles-class submarine USS Annapolis is seen on the surface of the Arctic Ocean after breaking through three feet(ninety centimeters) of ice during Ice Exercise 2009, a training and research exercise.(Agencies)

In this Saturday, March 21, 2009 photo released by the U.S. Navy, the Los Angeles-class submarine USS Annapolis is seen on the surface of the Arctic Ocean after breaking through three feet (ninety centimeters) of ice during Ice Exercise 2009, a training and research exercise.(Agencies)

In this Saturday, March 21, 2009 photo released by the U.S. Navy, the Los Angeles-class submarine USS Annapolis is seen on the surface of the Arctic Ocean after breaking through three feet(ninety centimeters) of ice during Ice Exercise 2009, a training and research exercise.