lo o ▁in ▁June ▁ 1 8 1 5 , ▁although ▁the ▁scheme ▁still ▁seemed ▁ill ▁placed ▁in ▁what ▁would ▁be ▁a ▁smaller ▁Royal ▁Navy , ▁the ▁final ▁plans ▁were ▁given ▁the ▁go ▁ahead ▁on ▁ 3 1 ▁October ▁ 1 8 1 5 . ▁The ▁Naval ▁D ock y ards ▁Society ▁published ▁a ▁historical ▁review ▁in ▁ 2 0 0 4 . ▁ ▁Oper ations ▁ ▁On ▁ 1 0 ▁February ▁ 1 8 1 6 , ▁the ▁first ▁two ▁ships ▁were ▁launched ▁from ▁the ▁dock yard ▁– ▁HMS ▁Val orous ▁and ▁Ari ad ne , ▁both ▁ 2 0 - gun ▁post - ships , ▁subsequently ▁converted ▁at ▁P ly mouth ▁D ock yard ▁into ▁ 2 6 - gun ▁ships . ▁Over ▁the ▁span ▁of ▁ 1 1 2 ▁years , ▁five ▁royal ▁y ach ts ▁were ▁built , ▁along ▁with ▁ 2 6 3 ▁other ▁Royal ▁Navy ▁vessels . ▁The ▁last ▁ship ▁launched ▁from ▁the ▁dock yard ▁was ▁the ▁Royal ▁Fle et ▁A ux ili ary ▁tank er ▁Ole ander ▁on ▁ 2 6 ▁April ▁ 1 9 2 2 . ▁ ▁In ▁ 1 9 2 5 , ▁it ▁was ▁announced ▁that ▁the ▁Royal ▁D ock y ards ▁at ▁P embro ke ▁D ock ▁and ▁Ros yth ▁were ▁redundant ▁and ▁would ▁be ▁closed . ▁A ▁pet ition ▁was ▁sent ▁to ▁Prime ▁Minister ▁Stanley ▁Bald win , ▁stress ing ▁the ▁lack ▁of ▁alternative ▁employ ment ▁and ▁the ▁economic ▁consequences ▁of ▁closure , ▁but ▁the ▁decision ▁was ▁not ▁over turn