 U @-@ 11 was renumbered by the Germans as U @-@ 70 when her class was redesignated as the Type U 66 . The Imperial German Navy had the submarines redesigned and reconstructed to German standards , which increased the surface displacement by 96 tonnes ( 94 long tons ) and the submerged by 48 tonnes ( 47 long tons ) . The torpedo load was increased by a third , from 9 to 12 , and the deck gun was upgraded from the 6 @.@ 6 cm ( 2 @.@ 6 in ) gun originally specified to an 8 @.@ 8 cm ( 3 @.@ 5 in ) one . 
