On 8th May 1945, generally known as V-E Day, which marked the end of the war in Europe, around 153 U-Boats were in differents stages of combat. Operational U-boats were ordered to surface and sail for Allied ports flying a black flag of surrender. Most made for the UK, although a few reached the US. On 9th May 1945, the first of over 150 surrendered boats started to arrive, but more than 200 were scuttled. Of those surrendering, a quarter were taken over by the Allied powers and the rest sunk by the Royal Navy in the Atlantic off Northern Ireland in Operation 'Deadlight' through to January 1946.

"Operation Deadlight" was the code name for the scuttling of U-boats surrendered to the Allies after the defeat of Germany near the end of the war. Of the 154 U-boats surrendered, 121 were scuttled in deep water off Lisahally, Northern Ireland or Loch Ryan, Scotland in late 1945 and early 1946.

German U-boat Fleet surrendered at different ports of the Atlantic Ocean, Baltic Sea and North Sea to Royal Navy, Canadian Navy and US Navy. 

German U-boats Surrender at Lisahally, Near Londonderry, Northern Ireland, 24 - 25 May 1945.
General view of Lisahally, showing the U-boat berths [A 28895 - Imperial War Museums. Via: Wikimedia]

One of eight U-boats that arrived in Londonderry after the German surrender in 1945 [Via: Belfasttelegraph]

German U-boats Surrender at Lisahally, Near Londonderry, Northern Ireland, 24 - 25 May 1945.
U-boat crews unload ammunition and supplies from their craft [A 28898 - Imperial War Museums. Via: Wikimedia]

42 surrendered U-boats moored at Lisahally, Northern Ireland in June 1945. A mass of surrendered German U-boats at their mooring at Lisahally, Northern Ireland. There are nine of the 21 class (1600 tons carrying 23 torpedoes), four of the 9 class (500 tons) and thirty nine of the 7 class (also 500 tons), a total of fifty two U-boats [A 29241 - Imperial War Museums. Via: Wikipedia]

Londonderry Port and the docks at Lisahally gave vital service to the Allies in the longest running campaign of World War II, the Battle of the Atlantic. This ended with the surrender of the German U-Boat fleet at Lisahally on 14 May 1945. About a dozen boats came alongside for that official surrender, taken by Admiral Sir Max Horton in the presence of US, Canadian and Republic of Ireland commanders; the other U-boats arrived over the next several weeks. Eventually all were dispatched to sea and sunk.

It was to Lisnahawley that a large number of German U-Boats were brought to after they had stopped fighting for their official surrender to be accepted at the end of the war [Via: WW2NI]

On the 14th of May 1945, at the end of WWII the German U-boat U-2326 surrendered in Dundee [Via: frigateunicorn]

The Highland fjord in the far north-west of Scotland, close to Cape Wrath, was the only Scottish rendezvous point for U-boats. In the space of two weeks, from May 10 to May 25, 1945, it turned into the biggest single gathering of the German submarine fleet [Via: Telegraph]

Surrender of the German submarine U-889 off Shelburne, Nova Scotia, May 13, 1945 [Library and Archives Canada/PA-173333. Via: Wikipedia]  

German U-boats Surrender at Lisahally, Near Londonderry, Northern Ireland, 24 - 25 May 1945.
Some of the twenty seven U-boats which arrived at Lisahally on 24 May shown moored alongside a wharf . One has its schnorkel erected [A 28899 - Imperial War Museums. Via: Wikimedia]

View of the first eight surrendered U-boats at Lisahally on 24th May 1945. The photo also shows to good effect the buildings around the former US Naval Base including the storage sheds, workshops and fuel storage tanks. Maydown airfield is also visible beyond. The eight U-boats were; U-293, U-802, U-826, U-1009, U-1058, U-1105, U-1109 and U-1305 [Via: US Forces in Northern Ireland during WW2]

A photo of surrendered German U-boats may hold the key to identifying what is in the image [Royal Navy Submarine Museum Gosport. Via: RTE]  

U-boat crews washing hanging out at Lisahally, near Londonderry after their surrender. At this time there were twenty seven surrendered U-Boats moored there [A 28897 - Imperial War Museums. Via: IWM]

Photo of U-boat surrender at Lisahally, Londonderry, Ireland [Via: u-historia]

The Polish Navy destroyer ORP Krakowiak towing German Type XXIII U-boat U-2377 out to sea for scuttling on 28 November 1945 during the Operation Deadlight [Imperial War Museums. Via: IWM]

U-boats in the lock at Wilhemshaven before entering the harbour to surrender [A 28659 - Imperial War Museums. Via: IWM]

U 236 coming alongside U 826 with the White Ensign flying, for inspection by British naval officers at Loch Eriboll, Scotland. Before surrendering U 826 had been on operational duties for more than five weeks [A 28528 - Imperial War Museums. Via: IWM]

A view astern showing the dismantled 20 mm gun of U 826 under the White Ensign flying from the periscope at Loch Eriboll, Scotland as Germany's U-Boat fleet began its surrender to the forces of the Royal Navy  [A 28528 - Imperial War Museums. Via: IWM]

U 1009, the first U-boat to surrender, arrives at Loch Eriboll, Scotland after a voyage from Bergen. With her black surrender flag flying, U 1009 approaches escort ships of the Royal Navy. In the background is the Captain class frigate HMS BYRON of the 21st Escort Group [A 28521 - Imperial War Museums. Via: IWM]

Under a dark sky the British corvette HMS LAUNCESTON CASTLE following the long trail of surrendered U-boats into Scapa Flow from Norway. There were two batches of ten and thirteen [A 28521 - Imperial War Museums. Via: IWM]

Two of the surrendering U-boats (left U 1109?, right U 1305?), in the background are three others. This was the biggest of the U-Boat surrenders, fifteen U-Boats in two columns and escorted by HM ships and aircraft of the Royal Navy headed into Loch Eriboll, Scotland [A 28906 - Imperial War Museums. Via: IWM] 

May 1945, Loch Alvie and surrendered U-Boat - E.G. 9 (Escort Group 9 - end of war) [National Archives of Canada PA191027. Via: Timetraces]

June 1945, U-190 in the harbour at St John's, Newvoundland after surrendering to Canadian Navy ships on May 12 [National Archives Canada mikan 3191843. Via: rcinet]

German boat U-805, the first Nazi submarine to surrender in New England waters, arrives in Portsmouth Harbor with American seamen seen here on board. Note rowboat in background. Many German souvenirs found their way into the city via a network of local onlookers. [AP Photo. Via: seacoastnh]

Surrendering German U-boat submarine (U-190) entering the harbour in St. John's, Newfoundland,1945 [Via: Reddit/HistoryPorn]

Surrendered German U-boats moored outside the Dora 1 bunker in Trondheim, Norway, May 1945 [Via: Wikipedia]

2nd submarine flotilla in Bergen, Norway. In the Center (more light) is U-2511 [Via: Ronnie Bell (Flickr)]

U 2511 lies between two other type XXI U-boats in Bergen. On the left is a type VII, 1945 [Via: coh2.org]

Capitulated German submarine U-234 escorted by two American Towings in New London [Via: waralbum]

U-530 after surrender at Mar del Plata Naval Base. An Argentine Navy boarding party inspects German u-boat U-530, July 1945 [Via: Wikipedia]

U-858, under close escort, steams for Delaware after surrendering off Cape May in May 1945 [Via: theamericanwarrior]

American sailors examine the snorkel of a surrendered U-boat, May 1945 [Via: Uboataces]

U-234 surrendering. Crewmen of USS Sutton in foreground [U.S. National Archives / Record Group 38. Via: Wikipedia]

U-249 in Portland during the surrender in May 1945. Type VIIC, she surrendered to HMS Amethyst [Via: uboataces]

Canadian seamen raise the White Ensign above a German submarine [Via: worldwarbattles]

U-190 after its surrender in Canada [Via: Uboat.net]

U-532, a Type IXC/40 submarine. Photographed entering Gladstone Dock, Liverpool after surrender to the Royal Navy [A 28677  - Imperial War Museums. Via: IWM]

A surrendered U-boat in the Thames 1945 [Via: worldwartwo.filminspector]

After surrendering at sea to HMS Magpie and Amethyst on 9 May 1945, U-249 was escorted to Weymouth Bay and met by the Boom Defense Vessel Northlyn where Commander N.P. Weir and a contingent of Polish sailors boarded and acepted the boat's surrender [Via: uboatarchive]

U 873 Type IXD-2 and U 234 Type XB in dock at Portsmouth NH 1945 [Via: greyfalcon]

German U-boat, U-858, under US flag after surrendering [Delaware State Parks. Via: tpc.dodlive.mil]