U-18 was a German coastal submarine of 250 tons displacement launched in 1935. She had a top speed of 13 knots surfaced, 7 knots submerged, could dive to 50 fathoms and carried a complement of 23. Armaments consisted of one 1 pdr anti-aircraft guns and three 21 inch torpedo tubes. U-18 was sunk in a collision in November 1936, but was salvaged shortly afterwards. Research U-18
 
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