▁Navy ▁on ▁ 1 8 ▁May ▁ 1 9 4 4 ▁at ▁Port ▁Arthur . ▁ ▁Background ▁The ▁class ▁to ▁which ▁she ▁belonged ▁had ▁been ▁designed ▁to ▁overcome ▁certain ▁weak ness es ▁which ▁had ▁been ▁revealed ▁in ▁actual ▁operation ▁in ▁the ▁earlier ▁. ▁The ▁relatively ▁limited ▁ste aming ▁radius ▁of ▁the ▁Bang or ▁class ▁less ened ▁its ▁useful ness ▁as ▁the ▁war ▁progress ed . ▁With ▁the ▁lay ing ▁of ▁mines ▁in ▁ever - de eper ▁waters , ▁swe pt ▁areas ▁had ▁to ▁be ▁extended ▁and , ▁for ▁this , ▁a ▁ship ▁with ▁greater ▁end urance ▁was ▁des irable . ▁This ▁class ▁of ▁ship , ▁too , ▁lack ed ▁the ▁space ▁to ▁convenient ly ▁accommod ate ▁the ▁new ▁types ▁of ▁equipment ▁which ▁were ▁being ▁added . ▁It ▁was ▁for ▁these ▁reasons ▁that , ▁in ▁ 1 9 4 1 , ▁the ▁Admir alty ▁began ▁to ▁develop ▁a ▁ship ▁which ▁eventually ▁supp l anted ▁the ▁earlier ▁mines we ep ers ▁in ▁the ▁construction ▁program mes ▁and ▁was ▁known ▁as ▁the ▁Al ger ine ▁mines we eper ▁first ▁and , ▁later , ▁coast al ▁esc ort . ▁ ▁Like ▁the ▁Bang or ▁class , ▁the ▁Al ger ine ▁was ▁prepared ▁to ▁function ▁either ▁as ▁an ▁anti - sub marine ▁esc ort ▁or ▁a ▁mines we eper . ▁However , ▁when ▁it ▁became ▁apparent ▁that ▁the ▁sub marine ▁pos ed ▁a ▁greater ▁danger ▁than ▁the ▁mine ▁in ▁the ▁areas ▁for ▁which ▁the ▁Royal ▁Canadian ▁Navy ▁was ▁responsible , ▁a ▁greater ▁emphas is ▁came ▁to ▁be ▁laid