. ▁ ▁Const ruction ▁ ▁The ▁U - 7 9 3 ▁was ▁laid ▁down ▁on ▁ 1 ▁December ▁ 1 9 4 2 ▁at ▁the ▁Blo hm ▁& ▁V oss , ▁Hamburg , ▁as ▁yard ▁number ▁ 4 5 6 . ▁She ▁was ▁launched ▁on ▁ 4 ▁March ▁ 1 9 4 4 ▁and ▁commission ed ▁under ▁the ▁command ▁of ▁Ober le ut nant ▁zur ▁See ▁Hor st ▁He itz ▁on ▁ 2 4 ▁April ▁ 1 9 4 4 . ▁ ▁When ▁she ▁was ▁completed , ▁the ▁sub marine ▁was ▁ ▁long ▁overall , ▁with ▁a ▁beam ▁of ▁ ▁and ▁a ▁dra ug ht ▁of ▁. ▁She ▁was ▁ass essed ▁at ▁ ▁sub mer ged . ▁The ▁sub marine ▁was ▁power ed ▁by ▁one ▁De utz ▁S AA ▁ 8 M 5 1 7 ▁super charg ed ▁ 8 - cy l inder ▁dies el ▁engine ▁producing ▁a ▁total ▁of ▁ ▁for ▁use ▁while ▁sur fac ed ▁and ▁one ▁Walter ▁gas ▁tur b ines ▁producing ▁a ▁total ▁of ▁ ▁for ▁use ▁while ▁sub mer ged . ▁She ▁had ▁one ▁sh aft ▁and ▁one ▁prop eller . ▁The ▁sub marine ▁had ▁a ▁maximum ▁surface ▁speed ▁of ▁ ▁and ▁a ▁maximum ▁sub mer ged ▁speed ▁of ▁ ▁using ▁the ▁HT P ▁drive . ▁When ▁sub mer ged , ▁the ▁U - bo at ▁could ▁operate ▁for ▁ ▁at ▁ ▁on ▁her ▁HT P ▁system ▁and ▁when ▁sur fac ed , ▁she ▁could ▁travel ▁ ▁at ▁. ▁ ▁The ▁sub marine ▁was ▁fitted ▁with ▁two