▁described ▁in ▁ 2 0 0 7 <0x0A> </s> ▁SS ▁San ▁Wil fr ido ▁was ▁a ▁ ▁steam - power ed ▁British ▁tank er ▁which ▁was ▁built ▁in ▁ 1 9 1 4 ▁by ▁Arm strong , ▁Whit worth ▁& ▁Co ▁Ltd , ▁in ▁the ▁Low ▁Walker ▁yard . ▁The ▁ship ▁was ▁operated ▁by ▁E agle ▁O il ▁Transport ▁Co ▁Ltd . ▁San ▁Wil fr ido ▁was ▁s unk ▁by ▁a ▁German ▁mine ▁on ▁ 3 ▁August ▁ 1 9 1 4 — one ▁day ▁before ▁Britain ▁formally ▁entered ▁the ▁First ▁World ▁War . ▁It ▁was ▁Britain ' s ▁first ▁naval ▁loss ▁of ▁the ▁war . ▁ ▁Description ▁ ▁The ▁ship ▁was ▁built ▁by ▁Arm strong , ▁Whit worth ▁& ▁Co ▁Ltd , ▁Low ▁Walker , ▁as ▁yard ▁number ▁ 8 5 6 . ▁She ▁was ▁launched ▁on ▁ 1 1 F ebru ary ▁ 1 9 1 4 ▁and ▁completed ▁in ▁April ▁ 1 9 1 4 . ▁Her ▁sister ▁ships ▁were ▁, ▁ ▁and ▁. ▁ ▁She ▁was ▁ ▁long , ▁with ▁a ▁beam ▁of ▁ ▁and ▁a ▁depth ▁of ▁. ▁She ▁had ▁a ▁G RT ▁of ▁ 6 , 4 5 8 ▁and ▁a ▁N RT ▁of ▁ 3 , 9 2 8 . ▁ ▁The ▁ship ▁was ▁prop elled ▁by ▁a ▁quad ru ple ▁expansion ▁steam ▁engine , ▁which ▁had ▁cyl ind ers ▁of ▁, ▁, ▁ ▁and ▁ ▁diameter ▁by ▁ ▁stroke . ▁The ▁engine ▁was ▁built ▁by ▁W alls end ▁S lip way ▁& ▁Engineering ▁Co ▁Ltd