The US Navy routinely conducts silent war games beneath the North Pole with foreign nuclear submarines. Occasionally the subs must poke their conning towers through the ice for communications, energy and research. However, when they expose themselves, they open themselves to the possibility of a vicious polar bear attack!!! Well, maybe these bears are just curious, but they still look terrifying (adorable). These pictures are courtesy of the US Navy from the Arctic.
Uraniumlicious… Polar Bears, Ursus maritimus