on ▁was ▁laid ▁up ▁in ▁oper ational ▁reserve ▁at ▁Hy the , ▁near ▁South am pton . ▁On ▁ 3 ▁January ▁ 1 9 6 3 ▁she ▁was ▁to wed ▁to ▁Dev on port ▁dock yard ▁where ▁she ▁was ▁ref itted ▁and ▁converted ▁to ▁a ▁mine h unter . ▁ ▁Her ▁magnetic ▁swe ep ▁g ear ▁was ▁removed ▁and ▁Type ▁ 1 9 3 ▁Son ar ▁was ▁fitted ▁to ▁detect ▁mines ▁which ▁could ▁then ▁be ▁destroyed ▁by ▁divers ▁while ▁active ▁rud ders ▁incorpor ating ▁electric ▁mot ors ▁were ▁fitted ▁to ▁aid ▁slow ▁speed ▁man oe uv rab ility , ▁and ▁the ▁ship ' s ▁engines ▁replaced ▁by ▁two ▁Nap ier ▁D elt ic ▁dies el ▁engines ▁r ated ▁at ▁. ▁She ▁was ▁recomm ission ed ▁on ▁ 1 6 ▁October ▁ 1 9 6 4 , ▁joining ▁the ▁ 1 st ▁Mine ▁C ounter ▁Me asures ▁Squadron ▁based ▁at ▁Port ▁Ed gar ▁on ▁the ▁F irth ▁of ▁For th . ▁ ▁Mut iny ▁ ▁There ▁was ▁a ▁mut iny ▁on ▁board ▁HMS ▁I vest on ▁at ▁Ul la pool ▁on ▁ 5 ▁July ▁ 1 9 7 0 . ▁This ▁was ▁the ▁last ▁mut iny ▁in ▁the ▁Royal ▁Navy ▁. ▁Five ▁of ▁the ▁crew ▁were ▁tried ▁by ▁court ▁mart ial ▁at ▁Ros yth ▁and ▁conv icted . ▁ ▁The ▁group ▁were ▁sent enced ▁to ▁det ention ▁for ▁terms ▁r anging ▁from ▁ 1 2 ▁to ▁ 2 1 ▁months , ▁and ▁dismiss ed ▁from ▁the ▁Royal ▁Navy ▁" with ▁dis gra ce ".