"IIIA" . . "XX" . . "Type XI B" . . "XXV" . "Type XI U-boats" . "Type XVIII U-boat" . "XXII" . . "Type XXII" . . "XIX" . "Type XXII U-boat" . "VI" . "VIIE" . . "Type XXIV U-boat" . "Uncompleted U-boat projects" . . "Type XXV U-boat" . "XIII" . . "Type XXVI U-boat" . "Uncompleted U-boat projects" . "XV" . "III" . "XVI" . "VIII" . "IV" . "Type V" . "XII" . "XXIV" . "Type XI" .