"The Submarine Hm Graph - Ex-u-boat 570. 20 April 1943, Holy Loch, the German Submarine U 570 Which Was Captured and Renamed HMS Graph. in 1941 a Hudson Aircraft Forced the U-boat To Surrender on the Surface, Units of the Royal Navy Arrived on the Scene, and Took Charge of the Surrendered U-boat, Taking the Crew Prisoner. on Arrival in a British Port, the Submarine Was Closely Examined, and Photographs of Its Interior Were Taken." The GRAPH from the beam.