were slightly larger than the original Type IXBs. U-125 had a displacement of when at the surface and while submerged. The U-boat had a total length of, a pressure hull length of, a beam of, a height of, and a draught of. The submarine was powered by two MAN M 9 V 40/46 supercharged four-stroke, nine-cylinder diesel engines producing a total of for use while surfaced, two Siemens-Schuckert 2 GU 345/34 double-acting electric motors producing a total of for use while submerged. She had two shafts and two propellers. The boat was capable of operating at depths of up to. The submarine had a maximum surface speed of and a maximum submerged speed of. When submerged, the boat could operate for at ; when surfaced, she could travel at. U-125 was fitted with six torpedo tubes, 22 torpedoes, one SK C/32 naval gun, 180 rounds, and a SK C/30 as well as a C/30 anti-aircraft gun. The boat had a complement of forty-eight.
Service history
1st and 2nd patrols
U-125 departed Kiel on 15 July 1941 on her first patrol, under the command of KapitänleutnantGünter Kuhnke, arriving in the recently captured French Atlantic port of Lorient fourteen days later. Her route took her along the Norwegian coast, through the gap separating the Faroe and Shetland Islands and into the Atlantic Ocean. Her second patrol took her down the coast of West Africa, then through the Atlantic and back to her home-port without making any attacks. She ranged far and wide, heading for Brazil and back to Africa, toward Sierra Leone and Liberia.
U-125 sailed on her fourth and most successful patrol from Lorient on 4 April 1942. She made her first attack on the 23rd, sinking the American merchant ship, about south-east of Bermuda. Between 3 – 18 May, she sank a further eight merchant ships, in the Caribbean, south of Cuba, returning to her home port on 13 June. One victim, Calgarolite, was hit by two torpedoes but despite settling, did not sink. The boat's AA guns were used to shoot holes in the hull. Following the demise of Camayagua, a US Navy aircraft unsuccessfully searched for the U-boat; then flew to Georgetown where it dropped a note in the Commissioner's garden with information on the survivors.
5th and 6th patrols
U-125s next patrol, the fifth, beginning on 27 July 1942, took her to the coast of West Africa, where she sank six merchant ships between 1 September and 8 October, returning to Lorient on 6 November 1942. Following the sinking of Baron Ogilvy on 29 September, the survivors sighted a small convoy on 1 October and succeeded in attracting their attention with flares. Unfortunately, one of them ignited in the Chief Officer's hand, causing severe burns. The Glendene went to the bottom 90 seconds after being hit. Despite this rapidity, 38 of the 43-man crew survived the sinking. U-125 sailed on her sixth patrol on 9 December 1942, out into the central Atlantic, south-west of the Azores, but she made no attacks before returning to Lorient on 19 February 1943.
7th patrol and loss
U-125 left Lorient for the last time on her seventh patrol on 13 April 1943. She joined the "wolfpack" "Fink" of 28 U-boats which were attacking the convoy ONS-5 between 26 April and 6 May 1943. This was during a period when the British code-breakers were unable to read German U-boat signals while they could read British convoy signals, and ONS-5 was intercepted by a strong U-boat force during an Atlantic storm. Nevertheless, the boat only sank one ship, on 4 May south of Cape Farewell, she was perhaps ironically called Lorient, a straggler from ONS-5; there were no survivors. ONS-5 was a 43-ship convoy, nine miles wide by two long, with one destroyer, one frigate, three corvettes and two rescue tugs to defend it. It was attacked by around thirty U-boats, and lost thirteen ships in total, while seven U-boats were sunk by the escorts and supporting aircraft. It was a particularly bloody battle which marked the turning point in the Battle of the Atlantic, showing that while determined mass attack by U-boats could break through convoy defences, this would prove too expensive a tactic to make U-boat warfare a winning strategy for Germany. Admiral Karl Dönitz lost his son in this battle.
Fate
At 03:00 on 6 May 1943 U-125 was located by radar in thick fog, rammed by and disabled, she was unable to dive. At 03:54 the U-boat was sighted by the Flower-class corvettes and, and as Snowflake manoeuvred to attack, closing to 100 yards, the crew of U-125, realising their indefensible position, scuttled the boat. The captain of Snowflake signalled the Senior Officer Escort, Lieutenant Commander Robert Sherwood, proposing to pick them up, and received the response: "Not approved to pick up survivors." Snowflake and Sunflower thereupon resumed their positions around the convoy, while the crew of U-125 died in the Atlantic over the next few hours.
