|Shipyard||Kaiserliche Werft, Danzig (Werk 12)|
|Ordered||6 May 1910|
|Laid down||27 Oct 1910|
|Launched||25 Apr 1912|
|Commissioned||17 Nov 1912|
|Fate||23 Nov 1914 - Rammed by HMS Garry and trawler Dorothy Grey in Pentland Firth, Scapa Flow (58.41N, 02.55W).. 1 dead and 22 survivors.|
There was another U 18 in World War Two
That boat was launched from its shipyard on 7 Dec 1935 and commissioned into the Kriegsmarine on 4 Jan 1936. Take a look at U 18 from WWII.