SM U-106 was one of the 329 submarine

Submarine

A submarine is a watercraft capable of independent operation below the surface of the water. It differs from a submersible, which has more limited underwater capability...

s serving in the Imperial German Navy (Kaiserliche Marine

Kaiserliche Marine

The Imperial German Navy was the German Navy created at the time of the formation of the German Empire. It existed between 1871 and 1919, growing out of the small Prussian Navy and Norddeutsche Bundesmarine, which primarily had the mission of coastal defense. Kaiser Wilhelm II greatly expanded...

) in World War I

World War I

World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

. U-106 was commissioned on 28 Jul 1917, under the command of Kapitänleutnant Hans Hufnagel, and participated in one wartime patrol starting on 2 September 1917. On 18 September 1917, during the First Battle of the Atlantic, U-106 was credited with the sinking of HMS Contest

HMS Contest

Ten ships of the Royal Navy have borne the name HMS Contest: or Gunboat No. 16 was a 14-gun vessel launched in 1797 and broken up in 1799. was a 5-gun gun-brig, previously the Dutch Hell-hound. She was captured in 1799 and broken up in 1803. was a 14-gun schooner purchased in 1799 and broken up...

, an Acasta class destroyer

Acasta class destroyer

The Acasta class was a class of twenty destroyers built for the Royal Navy under the Naval Programme of 1911 - 1912 that saw service during World War I...

, and damaging "City of Lincoln", a 5,867 ton steamer, in the Western Approaches

Western Approaches

The Western Approaches is a rectangular area of the Atlantic ocean lying on the western coast of Great Britain. The rectangle is higher than it is wide, the north and south boundaries defined by the north and south ends of the British Isles, the eastern boundary lying on the western coast, and the...

. She was lost off Terschelling

Terschelling

Terschelling is a municipality and an island in the northern Netherlands, one of the West Frisian Islands.Waddenislanders are known for their resourcefulness in using anything and everything that washes ashore. With few trees to use for timber, most of the farms and barns are built with masts...

 after striking a mine on 7 October 1917.

In 2009 the Royal Netherlands Navy

Royal Netherlands Navy

The Koninklijke Marine is the navy of the Netherlands. In the mid-17th century the Dutch Navy was the most powerful navy in the world and it played an active role in the wars of the Dutch Republic and later those of the Batavian Republic and the Kingdom of the Netherlands...

 found the wreckage of the ship north of Terschelling

Terschelling

Terschelling is a municipality and an island in the northern Netherlands, one of the West Frisian Islands.Waddenislanders are known for their resourcefulness in using anything and everything that washes ashore. With few trees to use for timber, most of the farms and barns are built with masts...

, while charting sea-routes. The news was made public in March 2011, after the ship's identity had been confirmed by German authorities and the crewmembers' families had been informed. The ship will stay in place as a wargrave.