U-559

U-559. It was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during the Second World War. Commissioned in early 1941, it conducted eight war patrols, primarily in the Mediterranean Sea and the North Atlantic Ocean. The submarine is most historically significant for its forced scuttling in the Eastern Mediterranean in October 1942, during which critical Enigma cipher material was captured by the Royal Navy, providing a major intelligence breakthrough for the Allies.

Service history

Following its commissioning under the command of Kapitänleutnant Hans Heidtmann, U-559 was assigned to the 1st U-boat Flotilla based in Brest. Its initial patrols in the North Atlantic targeted Allied convoys, including those on the vital Arctic route to the Soviet Union. In late 1941, the boat was transferred to the 29th U-boat Flotilla and operated in the Mediterranean Sea, where it patrolled off the coasts of Egypt and Palestine. During these deployments, it engaged several Allied vessels, contributing to the intense naval struggle for control of the Mediterranean supply lines. The submarine's final commander was Oberleutnant zur See Heidtmann, who led it on its fateful last patrol.

Construction and specifications

U-559 was constructed at the Blohm & Voss shipyard in Hamburg, a major producer of Kriegsmarine vessels. As a Type VIIC, it was the workhorse of the German submarine fleet, with a displacement of 769 tonnes surfaced and 871 tonnes submerged. Its propulsion system consisted of two MAN diesel engines for surface running and two Siemens electric motors for submerged travel, granting it a top speed of over 17 knots on the surface. Armament included five torpedo tubes and a deck gun, typical for engaging both merchant shipping and naval escorts. The boat's design emphasized ruggedness and operational range, suitable for extended patrols far from bases like those in occupied France.

Fate

The end for U-559 came on 30 October 1942, northeast of Port Said. Located by the British destroyer HMS *Petard* and other vessels from the Royal Navy's Force K, the submarine was subjected to a sustained depth charge attack that forced it to the surface. As the German crew abandoned ship and began scuttling procedures, a boarding party from *Petard* and the destroyer HMS *Pakenham* entered the stricken vessel. Despite the U-boat rapidly filling with water, the British sailors recovered crucial documents and equipment before it sank. Tragically, two of the boarders, Able Seaman Colin Grazier and Lieutenant Tony Fasson, drowned when the submarine suddenly went down.

Discovery of the wreck

The wreck of U-559 was located in the deep waters of the Eastern Mediterranean in the late 20th century, though its exact coordinates are not widely publicized. The discovery was made by a team using advanced side-scan sonar technology, similar to that used to find other historic wrecks like HMS *Hood*. The site is considered a war grave, respecting both the German sailors lost and the British personnel who perished during the capture. Investigations of the debris field confirmed the vessel's identity and the violent nature of its final moments from the depth charge attack and subsequent scuttling.

Significance of the Enigma capture

The capture from U-559 was of monumental importance to the Allied war effort. The material seized included the current Enigma codebooks for the *Triton* network, used by U-boat Command in the Atlantic. This intelligence coup, handled by experts at Bletchley Park, allowed cryptanalysts like Alan Turing to break the complex four-rotor Enigma cipher much more rapidly. The resulting flow of decrypted signals, known as Ultra, provided the Admiralty with near-real-time knowledge of Kriegsmarine submarine movements. This directly contributed to the decisive Allied victory in the Battle of the Atlantic during the critical spring of 1943, drastically reducing Allied shipping losses.