A forgotten piece of Cork naval history

When I was a child my maternal grandmother “Babs” (Scriven) Watkins often spoke of the death of her brother Richard Scriven in the sinking of the SS Lismore by a German U-boat as it was “going out of the harbour”.
The assumption was that she was talking about Cork Harbour. I often wondered why the sinking of a Cork ship with a Cork crew, near Cork Harbour, had not received any publicity.