Basic Details Surname Cooper Forenames John Gender Male Information stated on memorial War Military Service Served or died Died Primary Service As stated on memorial Unit (Primary - Stated) HM Submarine Affray Rank / Title (Primary - Stated) Petty Officer Our References Service (Primary - Our reference) Royal Navy Unit (Primary - Our reference) HM Submarine Affray Rank / Title (Primary - Our reference) Petty Officer Death and Burial details Country of death English Channel Year of death 1951 Month of death April Day of death 16 Manner of death as stated Submarine sank after accident Manner of death reference Missing