hms hms class submarine built royal_navy world war far ship royal_navy bear completed boat spent war mediterranean sank number small merchant ships naval major success war small slow post war environment scrapped design description hms second group class submarines ordered august submarines differed predecessors lengthened feet streamlined shape aft improve flow water propellers submarine feet inches long feet inches single hull internal ballast tanks draft feet inches surfaced displaced long tons submerged long tons surface submarine equipped diesel engines twin general_electric electric motors surfaced submerged running respectively coupled diesel electric transmission surface speed knots mph fast knots mph underwater boat carry long tons diesel fuel giving range nautical miles knots mph electric motors batteries provided range nautical miles knots mph submerged hms equipped inch bow torpedo tubes carry torpedoes submarine armed inch gun deck gun crew men career hms ordered august naval construction programme laid launched february commissioned apart work patrol spent bulk war mediterranean working fired torpedo thought submerged enemy submarine sighted torpedo fired direction detected german submarine area whilst service mediterranean sank number small small naval auxiliary vessels torpedoes gunfire included italian auxiliary submarine italian merchants italian italian sailing vessels german auxiliary submarine italian tanker small italian merchant italian auxiliary small italian vessel san_francisco damaged italian torpedo boat december sank damaged axis ships july operation july stationed offshore mark landing beaches 1st boat survived war slow requirements retained war scrapped ferry wales beginning january
HMS Unrivalled (P45)