SM U-85 was one of the 329 submarines serving in the Imperial German Navy in World War I.
U-85 was engaged in the naval warfare and took part in the First Battle of the Atlantic.

Initially  to  had one 10.5 cm gun with 140-240 rounds.  -  on the other hand had two 8.8 cm guns. In 1917  -  were refitted with a single 10.5 cm gun (240 rounds)

Design
German Type U 81 submarines were preceded by the shorter Type UE I submarines. U-85 had a displacement of  when at the surface and  while submerged. She had a total length of , a pressure hull length of , a beam of , a height of , and a draught of . The submarine was powered by two  engines for use while surfaced, and two  engines for use while submerged. She had two propeller shafts. She was capable of operating at depths of up to .

The submarine had a maximum surface speed of  and a maximum submerged speed of . When submerged, she could operate for  at ; when surfaced, she could travel  at . U-85 was fitted with four  torpedo tubes (two at the bow and two at the stern), twelve to sixteen torpedoes, and one  SK L/45 deck gun (from 1917). She had a complement of thirty-five (thirty-one crew members and four officers).

Summary of raiding history

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World War I submarines of Germany
German Type U 81 submarines
Ships built in Kiel
1916 ships
U-boats commissioned in 1916
Maritime incidents in 1917
U-boats sunk in 1917
Submarines lost with all hands
World War I shipwrecks in the North Sea