▁hole ▁in ▁the ▁sub marine ' s ▁bow . ▁Two ▁sub mar in ers ▁were ▁slightly ▁injured . ▁After ▁the ▁ground ing ▁incident ▁civil ian ▁and ▁military ▁sub mar in ers ▁began ▁pre - main ten ance ▁work ▁on ▁the ▁sub marine , ▁in ▁the ▁expectation ▁of ▁an ▁extended ▁maintenance ▁program . ▁At ▁the ▁time , ▁the ▁process , ▁length ▁and ▁cost ▁of ▁the ▁work ▁was ▁unknown ▁due ▁to ▁existing ▁contract s . ▁A ▁board ▁of ▁inqu iry ▁formed ▁after ▁the ▁collision ▁found ▁that ▁the ▁cause ▁of ▁the ▁collision ▁had ▁been ▁human ▁error . ▁In ▁February ▁ 2 0 1 2 , ▁post - coll ision ▁photos ▁of ▁the ▁dry - d ock ed ▁sub marine ▁were ▁published , ▁showing ▁extensive ▁damage ▁to ▁the ▁bow ; ▁the ▁media ▁also ▁c ited ▁uno fficial ▁sources , ▁saying ▁the ▁pressure ▁h ull ▁may ▁be ▁dam aged ▁beyond ▁repair . ▁ ▁As ▁of ▁July ▁ 2 0 1 4 , ▁Cor ner ▁Brook ▁began ▁her ▁Ext ended ▁D ock ing ▁Work ▁Period ▁( ED WP ) ▁that ▁was ▁expected ▁to ▁take ▁until ▁ 2 0 1 7 ▁to ▁complete . ▁On ▁ 1 ▁April ▁ 2 0 1 9 ▁the ▁sub marine , ▁still ▁in ▁dry d ock ▁at ▁CF B ▁Es qu im alt , ▁caught ▁fire . ▁The ▁fire ▁was ▁ex ting u ished ▁but ▁the ▁cause ▁was ▁unknown . ▁ ▁References ▁ ▁S ources ▁ ▁External ▁links ▁ ▁H M CS ▁Cor ner ▁Brook ▁ ▁Category : F le et ▁of ▁the ▁Royal