List of all U-boats




Ordered15 Dec 1937
Laid down22 May 1939 F. Krupp Germaniawerft AG, Kiel (werk 594)
Launched10 Apr 1940
Commissioned30 May 1940Kptlt. Joachim Schepke (Oak Leaves)
30 May 1940 - 17 Mar 1941  Kptlt. Joachim Schepke (Knights Cross)
6 patrols
30 May 1940-1 Aug 1940  7. Flottille (training)
1 Aug 1940-17 Mar 1941  7. Flottille (active service)
Successes25 ships sunk, total tonnage 135,614 GRT
4 ships damaged, total tonnage 17,229 GRT
1 ship a total loss, total tonnage 2,205 GRT

Sank at 0318hrs on 17 March 1941 in the North Atlantic south-east of Iceland, in position 61.04N, 11.30W, after being rammed by the British destroyer HMS Vanoc and depth charges from this destroyer and HMS Walker. 38 dead and 6 survivors.

Loss position

See the 30 ships hit by U-100 - View the 6 war patrols

Attacks on this boat and other events

17 Aug 1940
20.45 hrs, 200 miles NW of Ireland: a destroyer dropped 7-8 depth charges shortly after U-100 located a convoy. The hydrophones were disabled and the boat lost contact with the convoy. (Sources: Ritschel)

22 Sep 1940
At the end of a very successful attack on convoy HX 72 in the Atlantic west of Ireland, the boat tried to hit Putney Hill with her last torpedo at 02.57 hrs, but missed, and was driven off by three rounds of shellfire from the merchantman. (Sources: Ritschel)

21 Oct 1940
During an attack on convoy HX 79, the boat was shelled by a tanker after missing it with a torpedo at 00.31 hrs. No damage. (Sources: Ritschel)

23 Nov 1940
After a successful attack on convoy SC 11 in the Atlantic west of Ireland, star shells from a destroyer forced U-100 to dive. The depth charging that then followed disabled the hydrophones. (Sources: Ritschel)

4 recorded attacks on this boat.

General notes on this boat

17 Mar 1941. U-100 was the first U-boat sunk after being located by radar. HMS Vanoc discovered her during an overcast night that would have kept U-100 safe from lookouts.

Men lost from U-boats

Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-100 did not suffer any casualties (we know of) until the time of her loss.

U-boat Emblems

We have 1 emblem entry for this boat. See the emblem page for this boat or view emblems individually below.

Black Panther - U-100

Media links

U-Boat Operations of the Second World War - Vol 1

Wynn, Kenneth

German U-Boat Losses During World War II

Niestle, Axel

Hitler's U-boat War

Blair, Clay

There was another U-100 in World War One
That boat was launched from its shipyard on 25 Feb 1917 and commissioned into the Imperial Navy on 16 Apr 1917. The Naval war in WWI was brought to an end with the Armistice signed on 11 Nov, 1918. Read about SM U 100 during WWI.

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