|Ordered||15 Aug 1940|
|Laid down||16 Sep 1941||Howaldtswerke Hamburg AG, Hamburg (werk 815)|
|Launched||18 Jul 1942|
|Commissioned||26 Aug 1942||Oblt. Herbert Engel|
|Successes||1 warship sunk, total tonnage 1,370 tons|
1 ship damaged, total tonnage 5,234 GRT
Listed as missing in the North Atlantic on 10 Feb 1944.
There is no explanation for its loss. 51 dead (all hands lost). (Axel Niestlé, September 1995).
Previously recorded fate
- Sunk 10 Feb 1944 in the North Atlantic west of Ireland, in position 53.56N, 17.16W, by depth charges from aircraft of the British escort carrier HMS Fencer. (Postwar assessment)
Notes. This attack was probably against a nonsub target.
U-666 operated with the following Wolfpacks during its career:
Ostmark (6 Mar 1943 - 11 Mar 1943)
Stürmer (11 Mar 1943 - 20 Mar 1943)
Seewolf (21 Mar 1943 - 30 Mar 1943)
Oder (17 May 1943 - 19 May 1943)
Mosel (19 May 1943 - 24 May 1943)
Trutz (1 Jun 1943 - 16 Jun 1943)
Trutz 2 (16 Jun 1943 - 29 Jun 1943)
Leuthen (15 Sep 1943 - 24 Sep 1943)
Rossbach (24 Sep 1943 - 6 Oct 1943)
Hela (28 Dec 1943 - 1 Jan 1944)
Rügen 6 (5 Jan 1944 - 7 Jan 1944)
Rügen (7 Jan 1944 - 26 Jan 1944)
Stürmer (26 Jan 1944 - 3 Feb 1944)
Igel 1 (3 Feb 1944 - 10 Feb 1944)
Attacks on this boat and other events
19 Mar 1943
Shortly after the Greek merchant Carras from convoy SC-122 being damaged in an attack by U-666, a British B-17 (RAF Sqdn 220, pilot William Knowles) hit the boat with 4 depth charges, causing serious damage and forcing the boat to abort to France. (Sources: Blair, vol 2, page 265)
9 May 1943
Aircraft attack, aircraft shot down:British Halifax bomber HR743 (RAF Sqdn 58/N, pilot F/S J.A. Hoather, DFM)
10.28 hrs, Bay of Biscay, outbound: the Halifax (misidentified as a Sunderland) only strafed the boat on its first attack and received several AA hits in one of the port engines during a second run. The pilot then apparently lost control when turning to come in again and the Halifax crashed into the sea about 500m from the boat, killing the crew of eight.(Sources: Franks/Zimmerman)
9 May 1943
12.25 hours, Atlantic NW of Corunna, Spain: the outbound U-666 was attacked by British Whitley BD278 (10 OTU RAF/C, pilot Sgt A.J. Salvage). The aircraft was hit by flak during the intial strafing run and its depth charges fell wide. After the boat dived, the aircraft was forced to return to base due to damage to the tail. (Sources: Franks/Zimmerman)
5 Jan 1944
U-666 was attacked by aircraft when outbound from Lorient (sailed 25 Dec, 1943). Damage was minor, and the boat made repairs at sea and continued the patrol, but was sunk with all hands on 10 Feb 1944. (Sources: Blair, vol 2, page 486)
4 recorded attacks on this boat.
Men lost from U-boats
Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-666 did not suffer any casualties (we know of) until the time of her loss.
We have 2 emblem entries for this boat. See the emblem page for this boat or view emblems individually below.