Action In The North Atlantic was a movie to inspire patriotism during WW2, and show the Nazis that the Allies would prevail, no matter how many supply ships they blow up in the North Atlantic. This movie really served it purpose in "43", and watching it today, it is till a good story.
Good supporting cast with Alan Hale and Raymond Massey, but only criticism is that they should have used sub titles for the German U boat crew. All in all good movie