Walter Moore was born on 24 October 1872, the son of Stephen Henry Moore and Julia Jane Moore of Blayden Villa, Marmion Road, Southsea, Hants.

In 1889 he entered Keyham College, Keyham Dockyard, Stoke Damerel, Devon, and in 1893 he was studying at the Royal Naval College, Greenwich.  After promotion to Assistant Engineer on 1 July 1894 he served in the cruiser HMS RALEIGH in 1894 and 1895.  He next served in the battleship HMS MAJESTIC from 1895 to 1897 and then in the cruiser HMS BARRACOUTRA on the Cape of Good of Hope and West Coast of Africa Station where he was promoted to Senior Engineer on 1 January 1899.

Walter Moore was then employed in Portland Dockyard in the construction of the Torpedo Range and with the running of torpedoes.  He was appointed to the cruiser HMS BLAKE ‘for the Torpedo Boat Destroyer HMS FALCON’ on 5 September 1905.  He had been relieved in HMS FALCON by 15 December 1908. He was promoted to Engineer Commander on 1 January 1911 and then appointed to HMS VICTORY for the Submarine Depot Ship HMS MAIDSTONE building at Messrs. Scotts of Greenock and then to HMS MAIDSTONE at Portsmouth ‘as Flotilla Engineer and for Duty with Submarines’ on 5 May 1911.  On 7 June 1913 he joined HMS E5 at Barrow in Furness as the submarine was completed, and sailed from Barrow for Portsmouth.

On 8 June 1913, whilst in the Irish Sea off Wales, E5 suffered an explosion in the Engine Room as the result of a diesel engine backfiring into the crankcase.  Walter Moore suffered serious burns and injuries.  He was landed ashore to hospital at Pembroke Dock where both legs were amputated but he died as the result of his injuries three days later.  CERA Greenall and Stoker Clark also died as a result of this explosion.

Walter Moore was buried in the Brompton Cemetery in London.