This new record is certainly impressive, but it's also depressing. The researchers report that the bear in question was "emaciated" and going after some seals sitting on an ice floe. Without the cover that colder waters full of ice floes may have provided, the hungry bear had no choice but to stay underwater if it wanted to be stealthy. Unfortunately, its prey got away.
It seems that polar bears will put up quite the fight against their rapidly changing habitat. Previous studies have shown that the bears are moving farther north, and researchers have spotted them eating unusual prey, like dolphins, in order to survive. But these piecemeal adaptations, while impressive, are unlikely to relieve the entire population as temperatures warm and ice disappears.