An officer with Baltimore's marine unit went well beyond the call of duty to rescue a dog trapped in frigid harbor waters. The officer donned a cold-water rescue suit and swam under two piers to save Penny, a 1-year-old Labrador that had leaped into the water after escaping from its home. "It was the right thing to do," the officer tells the Baltimore Sun. The dog "was struggling. Exhausted." Penny, who had spent around 2 hours in the water, was reunited with her owner after being treated for cold-water exposure and hypothermia. (More Baltimore stories.)