German submarine U-1308

U-1308 was the last Type VII/41 submarine to be laid down, launched and commissioned by the German Kriegsmarine during World War II. The Oberkommando der Marine or OKM, (the German naval high command), had decided near the end of World War II to put all of its resources into building newer types of Unterseeboot, such as the types XXI and XXIII. U-1308 was part of a batch of eight U-boats (U-1301 to U-1308) ordered on 1 August 1942 to be built at Flensburger Schiffbau-Gesellschaft, Flensburg (54.80833°N, 9.43517°W). She was laid down on 16 February 1944 and launched on 22 November. The eight boats were commissioned over a 12-month period between February 1944 and 17 January 1945.

As U-1308 was the last Type VII, the Kriegsmarine fitted her out to be one of the most advanced. U-1308 was one of nine Type VIIs that the Kriegsmarine fitted with an experimental synthetic rubber skin of anechoic tiles known as Alberich, which had been designed to counter the Allies' asdic/sonar devices. U-1308 was also one of two Type VIIC/41s that was equipped with a new design of passive sonar hydrophones, thus increasing detection ranges by approximately 70% over the older designs.

A few days before Germany surrendered on 8 May 1945, U-1308 was taken approximately 5 km north-west of Warnemünde and scuttled on 2 May at approximately 54.21667°N, 12.03333°W. During the final days of Nazi Germany there was a plethora of U-boats which suffered the same fate. In the last week of the war, 28 other boats joined her.

Emblem
U-1308's emblem was an oak leaf, with an anchor and a knife or dagger. She shared this emblem with GS U-3 (1935), GS U-29 (1936), GS U-120 (1940), U-747 and U-1274.

Commander
Heinrich Besold was born on 18 October 1920 in Nürnberg. He rose through the ranks of Offiziersanwärter (16 September 1939), Fähnrich zur See (1 July 1940), Oberfähnrich zur See (1 July 1941), Leutnant zur See (1 March 1942) and Oberleutnant zur See (1 October 1943). He also served aboard two other U-boats, GS U-981 between March and May 1944 and GS U-518 between July and November 1944. He commanded U-1308 during her working-up at the 4th U-boat Flotilla. He was decorated on 29 October 1944 with the Iron Cross 2nd Class and the U-boat War Badge 1939.

Other crew members

 * Bernhard Hamann
 * Helmut Hoffmann; Born 28 June 1921; Serial/entry UO.10437/40.T.
 * Josef Stumbaum; Born 1926

Bridge
The bridge was equipped with a UZO (Ünderwasserzieloptik) pedestal located forward. While making a surface attack, a set of large, heavy binoculars were mounted on top of the pedestal. Information of the bearing to the target was transmitted to the control room, where an electro-mechanical computer calculated the exact angle for firing the torpedoes. Sometime late in World War II, an updated version of the UZO entered service with the Type VIIC boats. U-1308 would have mounted the latest version. U-1308, like most Type VIIs, IXs and XXIs, was equipped with two periscopes, one for the attack, the second for the purposes of navigation and search. This observation periscope was frequently used during twilight and night attacks, as it let in more light and had better light transmission. The observation periscope had two magnifications - 1.5× and 6×. The attack periscope was used exclusively for that purpose. To make it less visible to the enemy and to reduce the wake, the periscope head and neck-size were keep to a minimum. The attack periscope was fitted with a heating system that served to prevent fogging of the lenses. U-1308's Direction Finder Antenna Loop was located on the starboard side of the bridge. It was used to detect and get bearings from the radio signals of Allied surface ships. U-1308 would have been outfitted with a late-war version which look slightly different from the earlier model.

Thetis
Thetis was the name of a floating decoy used by U-Boats to confuse Allied warship radars. The device was stored, dismantled, in the bow compartment, as a pole about 2 m long. Assembly usually took place in the conning tower, it could be put together in about four minutes. Later versions could be launched from the standard torpedo tube. When deployed it was extended to a total length of 4 m, half of which was submerged. The upper half had a series of radar reflectors that were tuned to Allied anti-submarine radar wavelengths to give the same return signal as a U-boat. U-1308 typically carried between 15 and 20 of these decoys.

Electric Motor
U-1308 was powered by two Siemens-Schuckert Type GGUB 720/8 electric motors. Each motor weighed 8130 kg, without its fan 7900 kg. Each rotor weighed 3200 kg. The Type GGUB 720/8 electric motor could create 1,540 A (560 kW) at between 7.5 Hz (450 RPM) and 10.3 Hz (620 RPM).

Schnorchel
U-1308 was the last Type VIIC/41 to be built and would have been fitted with a schnorchel, (This apparatus enhanced the U-boats' performance below the surface and made its position more difficult to detect). Later model Type VIIC/41 boats were built with the device from the start. She would have been constructed with the final version of the schnorchel.

Passive sonar
U-1308 was one of four Type VIIC/41s to be fitted with a Balkongerät (literally 'Balcony apparatus or equipment'). The Balkongerät was standard on the Type XXI and the Type XXIII. Nonetheless, it was also fitted to several Type VIICs and Type IXs and one Type X.

Anti-sonar coating
U-1308 was one of nine Type VIIs that the Kriegsmarine fitted with an experimental synthetic rubber skin of anechoic tiles, designed to counter the Allies' sonar devices. The code name Alberich was given to the coating. The OKM named it after the dwarf with the helmet of invisibility in Wagner's Ring Cycles. It was the first coating for any submarine.

Torpedoes

 * five × 533 mm (21 in) torpedo tubes (four bow, one stern)
 * 14 × torpedoes