I wonder how many people see bears swimming across the arms and canals of Puget Sound. My bet is that it happens all the time, but few to nobody sees it.
People never report bears swimming across Turnagain Arm south of Anchorage, and the mere thought of any living creature trying it sounds like suicide. The mud is like quicksand, and the tides are so incredibly ferocious that a bore tide is common.
But after fitting a black bear that repeatedly got itself into trouble in Anchorage with a collar equipped with a satellite sender, ADFG was astounded to see that the bear promptly left town, swam across Turnagain Arm (instead of simply going around it), traversed Resurrection Pass, and the signal stopped along Skilak Lake Road. They drove to the site and found that the collar had been cut, meaning the bear had been shot and killed. The harvest had not been reported, which indicated that the “hunter” shot the bear illegally (no license or tag, which is free) even though it was a legal hunting area and black bear was open for hunting.
A couple of years ago I myself saw a grizzly wandering around out on the mudflats of Turnagain Arm for the first time in my life, despite having traveled it countless times since 1975, including being a railroad track inspector there for a year.