The following is taken from the document AIR 41/47.

August 1941 ended with a episode unique in air operations - the surrender of a U-boat to an aircraft.

Hudson "S" of No.269 Squadron (Pilot S/L. Thompson. Navigator F/O. Coleman) based in Iceland while on an A/U sweep on 27 August sighted a U-boat at 1050 hrs at a distance of 1200 yards apparently just having surfaced (About 80 miles south of Iceland) The aircraft immediately attacked and from an altitude of 100 feet released 4 - 250lb Amatol filled depth charges set to detonate at 50 feet depth. The stick straddled the U-boat while in the act of diving. When the explosion plumes of water and spray had subsided the U-boat was seen to have resurfaced in a bows down condition and 10 - 12 men were gathered on the conning tower and round the gun. The aircraft attacked with machine-gun fire whereupon a piece of white material was waved from the bridge. Shortly afterwards more of the crew crowded on to the bridge displaying a large white painted board.

The aircraft informed base of the situation and kept patrolling close round and over the U-boat until relieved at 1345 hrs by Catalina "J" 0f No.209 Squadron. Signals had been sent to the nearest A/S trawlers on patrol to close the position but if none had arrived on the scene by nightfall the aircraft was instructed to sink the U-boat after giving due warning. However, at 2250 hrs the first A/U trawler arrived but the heavy seas prevented a boarding party being sent. The U-boat was ordered to show a white light and close watch was maintained throughout the night. By 0830 hrs on the 28th, six more trawlers had arrived but the state of the sea still frustrated all attempts at boarding or passing a tow and the U-boat was definitely settling by the head. Orders to the U-boat's crew to blow more ballast and oil fuel to regain trim were disregarded until encouraged by a burst on M/G fire.
At 1530 hrs. U 570 was boarded with the aid of a Carley float, the wounded were transshipped and at 1600 hrs the U-boat was in tow Stern first.

She was finally beached at Thorlakshafn near Reykjavik.