Well if that's a submarine, I have seen more convincing pictures of the Loch Ness monster - also sonar. And of the spurious "Nazi gold" in the Toplitzer See - also sonar. Sonar pictures are as open to wild interpretation as those shadow pictures you make with your hand on a wall or Rorschach ink blots. There is no scale on the picture, so does it cover a width of an inch, a mile, or what?

And could someone even suggest why a U-boat should be 60 miles up a river in Labrador. Were they looking for the North-West Passage?