When a submarine sank several years ago off Provincetown, divers descended to see if there were any signs of life.  Looking at a situation which seemed hopeless, a diver heard a tapping sound.  Yes, it was something coming from within the hull of the disabled vessel.  The diver listened carefully.  There was a rhythm to it, and then, drawing from what he had learned many years before, he recognized the pattern.  Over and over, the person inside was tapping out the message in Morse Code, "Is there hope?"