🌐EnglishEnglishFrançaisPolskiالعربيةفارسی中文EntityQ7391621· pop 6· linked from 62 articlesSM UB-121915 Type UB I submarineAvailable in 6 languagesFrançais中文العربيةPolskiفارسیvia Wikidata sitelinks · CC0ConnectionsImperial German NavyEntitygross register tonnageEntityCategories1915 shipsGerman Type UB I submarinesMaritime incidents in 1918Missing U-boats of World War IShip infoboxes without an imageShips built in BelgiumShips built in Bremen (state)U-boats commissioned in 1915U-boats lost with all handsU-boats sunk in 1918World War I shipwrecks in the Atlantic OceanWorld War I submarines of Germany