▁on ▁ 1 5 ▁August ▁ 1 9 4 0 , ▁U - 3 3 5 ▁was ▁laid ▁down ▁on ▁ 3 ▁January ▁ 1 9 4 1 ▁at ▁the ▁Nord see werke ▁yard ▁at ▁Em den ▁as ▁yard ▁number ▁ 2 0 7 , ▁launched ▁on ▁ 1 5 ▁October ▁and ▁commission ed ▁on ▁ 1 7 ▁December ▁under ▁the ▁command ▁of ▁Kap it än le ut nant ▁Hans - H erman ▁Pil k ner . ▁ ▁Between ▁ 1 7 ▁December ▁ 1 9 4 1 ▁and ▁ 2 9 ▁July ▁ 1 9 4 2 , ▁U - 3 3 5 ▁conducted ▁training ▁with ▁the ▁ 8 th ▁U - bo at ▁Fl ot illa . ▁At ▁the ▁end ▁of ▁her ▁training ▁period , ▁U - 3 3 5 ▁was ▁assigned ▁to ▁join ▁the ▁ 6 th ▁U - bo at ▁Fl ot illa , ▁based ▁in ▁St . N az aire , ▁France . ▁The ▁boat ' s ▁one ▁and ▁only ▁pat rol ▁began ▁with ▁her ▁departure ▁from ▁K iel ▁on ▁ 3 0 ▁July ▁ 1 9 4 2 . ▁Atlantic - bound , ▁she ▁was ▁tor ped o ed ▁and ▁s unk ▁by ▁the ▁British ▁sub marine ▁ ▁sout heast ▁of ▁the ▁Far oe ▁Islands ▁on ▁ 3 ▁August . ▁Fort y - three ▁men ▁died ; ▁there ▁was ▁one ▁surv iv or . ▁ ▁References ▁ ▁Bibli ography ▁ ▁External ▁links ▁ ▁U - bo at ▁Archive : ▁" U ▁ 3 3 5 " ▁Inter