▁ ▁for ▁use ▁as ▁h unter - k iller ▁and ▁training ▁subs . ▁The ▁sub mar ines , ▁which ▁have ▁a ▁single - sk inned , ▁te ard rop - sh aped ▁h ull , ▁dis place ▁ ▁sur fac ed ▁and ▁ ▁sub mer ged . ▁They ▁are ▁ ▁long ▁overall ▁with ▁a ▁beam ▁of ▁ ▁and ▁a ▁dra ug ht ▁of ▁. ▁ ▁The ▁sub mar ines ▁are ▁power ed ▁by ▁a ▁one ▁sh aft ▁dies el - elect ric ▁system . ▁They ▁are ▁equ ipped ▁with ▁two ▁P ax man ▁Val enta ▁ 1 6 0 0 ▁R PS ▁S Z ▁dies el ▁engines ▁each ▁driving ▁a ▁ ▁G EC ▁electric ▁altern ator ▁with ▁two ▁ 1 2 0 - cell ▁ch lor ide ▁batter ies . ▁The ▁batter ies ▁have ▁a ▁ 9 0 - hour ▁end urance ▁at ▁. ▁ ▁The ▁ship ▁is ▁prop elled ▁by ▁a ▁ ▁G EC ▁dual ▁arm ature ▁electric ▁motor ▁turning ▁a ▁seven - bla de ▁fixed ▁pitch ▁prop eller . ▁They ▁have ▁a ▁ ▁dies el ▁capacity . ▁This ▁gives ▁the ▁subs ▁a ▁maximum ▁speed ▁of ▁ ▁on ▁the ▁surface ▁and ▁ ▁sub mer ged . ▁They ▁have ▁a ▁range ▁of ▁ ▁at ▁ ▁and ▁ ▁at ▁sn ort ing ▁depth . ▁They ▁have ▁a ▁range ▁of ▁ ▁at ▁. ▁The ▁class ▁has ▁a ▁reported ▁d ive ▁depth ▁of ▁over ▁. ▁ ▁The ▁U ph older / V ict oria ▁class ▁are ▁armed ▁with ▁six ▁ ▁tor ped o ▁tub es .