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 "HASTEN SLOWLY"22 December 1969 - 29 March 1999
HMAS Onslow was named after an Australian river. The name comes from a family well known in early Australian history. The founder was Arthur Pooley Onslow who carried out surveying duties for the administration during the early part of of the 19th century and then became Justice of the Peace. He had two sons, Arthur Alexander and Alexander Campbell.
 The first joined the Navy, retired after achieving the rank of Captain and then entered politics. the second was called to the English Bar in 1868, became Attorney General of Western Australia and finally the state's Chief Justice in 1883. He was knighted in 1895. The town of Onslow in Western Australia is named after this brother.
 
 The significant aspects of the submarines crest are a Chief Justice's wig and a bunch of flowers used by the justice when investigating the case of the rather smelly prisoners who predominated in those days. The submarine's motto "Festina Lente" is latin for Hasten Slowly.
 
 The first hull section was placed in position on the 29th of May, 1967 by Commodore DHD Smith RAN. The submarine was launched by HRH Princess Alexandria on the 22nd of December, 1969 at Scott's Shipyards in Greenock, Renfrewshire, Scotland.
  
 On 1 March 1981, Onslow participated in wargames with a Royal New Zealand Navy frigate off the coast of Sydney. While operating at periscope depth, the submarine spotted an 'enemy' P-3C Orion aircraft and stopped snorting (the process of taking in air to operate the boat's two diesel generators and expelling the produced exhaust through a snorkel) in preparation to go deep. Both generators were turned off, but upon diving, it was quickly discovered that the starboard diesel had failed to switch off or had restarted and as the exhaust snorkel was sealed, the carbon monoxide exhaust filled the submarine. Onslow rapidly resurfaced, and the exhaust was pumped from the submarine. Able Seaman Christopher Passlow, who had been on the lower deck of the submarine at the time, died of asphyxiation and carbon monoxide poisoning, while another eighteen were rendered unconscious or were convulsing because of blood poisoning. Upon returning to base, doctors found that one-third of the 66 survivors had absorbed twice the lethal limit of carbon monoxide into their blood. The crew onboard were taken to Soldiers Beach surf club and provided with free alcohol for 3 days before returning back to duties. They were not compensated in any other way as stated they were by the RAN.
 
 The RAN Board of Inquiry into the incident concluded that the accident was caused by human error—the duty engineer failed to shut down both engines—but members of Onslow's complement disagree with this, claiming the problem to be mechanical in origin. Changes were made to Submarine Service operating procedures as a result of the Inquiry, but the investigation and subsequent report remained classified until 2009, when the information was acquired by the Sunday Night newsmagazine program under the Freedom of Information Act. When interviewed by Sunday Night in March 2009, the deputy Chief of Navy, Rear Admiral Davyd Thomas (who had been Passlow's divisional officer prior to the incident) promised counselling for the survivors, and claimed that prior treatment of the Onslow submariners was due to a limited understanding of post-traumatic stress disorder back in the 1980s.
 
 
  During her career, Onslow became the first conventionally powered submarine to be fitted with anti-ship missiles, and was successful in wargames, "sinking" a seven-ship flotilla during Exercise Kangaroo 3 in 1980 and the United States supercarrier USS Carl Vinson at RIMPAC 1998. After being decommissioned in March 1999, Onslow was then presented to the Australian National Maritime Museum in April, where she is preserved as a museum ship.
   
 |  Images of HMAS Onslow over the years       | 
			  
				    
				  DE-COMMISSIONING CREW
				      LCDR CAB Nixon-Eckersall RN  CO
 |  |  |  |  LEUT TDA Bowra XO | LCDR GD White | LEUT BC Clarke |  | LEUT MT Dunne | LEUT GD Anderson | SBLT KF Pitt |  | SBLT GW Fisher |  |  |  |  |  |  |  | CPO Cox'n RW Budd  † | CSAW DJ Luck | MECH JC Sneyd |  | ERA CC Corney | MECH DJ Elliott † | POUC L Clarkson |  | POME HJ Rutter | RS G O'Keefe † | POEWR WC Watego |  | LSUC RA Hardwicke | LME JR Dale | LME CG Stocker |  | LRO JL Brown | LEMP KG Thompson | LEMP KG Thompson |  | ABUW RT Kelly | ABRO RV Sylvester † | EMWR PKR Thorpe |  | ABUW DK Petty | ABRO ME Regan | ME RF Wilson |  | ABUC IP Haw | ME AC Ellard | ABUC NH Steyn |  | ME JE Clelland | ME RW Mees | ME MJ Hamilton |  | ME RW Evans | CME HJ Carey † | CERA RJ Dunstan |  | MECH MJ Kidd  † | ERA PC Edwards | PORP JR Head |  | POEP BJ Birch  † | POUW R Lawrence | SAP RI Madden |  | SAWS J Beekman | LEMP K Brazier | LSUW WR Cummins |  | LSRP RP Glover | LSTD JR Cornish | LME T Rutherford |  | ABUC TJ Spencer  † | ABCK JD Simounds | ME JR McCrohen |  | EMWR RW Andrews | ABUW JA Rana | EMP WJ Bacon |  | ABUW RA Steley | EMP DC Petherick | ABUC AM Urquhart |  | ABRP JW Heinze | ABRP JR Kelly | ME JH Joyce |  |  HMAS ONSLOW - 29 MARCH 1999
 
				    
				  COMMANDING OFFICERS - HMAS OXLEY
				   	 | LCDR SPM O'Dwyer  CO |  |  |  |  LCDR RS Walker | LCDR MW Orr | LEUT BK Slape |  | LEUT JR Martins | LEUT GA Miles | LEUT SJ Doolin |  |  |  |  |  | CPONPC RA Young | CPOUW AS Florance | POET RJ Muir |  | CPOMT SAC Hendrick | POMT GR Bunting | POMT GW Anderson |  | CPOET BC Snow | POEW SW Bartlett | LSMT JT Woodward |  | POMT MA Jones | PORS MD Cossey | LSMT PC Mullins |  | LSMT RJ Hodson | POMT K Harris | LSET DJ Crouch |  | LSET MP Foster | LSMT GR Milne | LSET TJ Samuels |  | LSET DI White | LSMT MA Watherston | LSMT DL Excell |  | LSAWA DE Engi | LSRO PW Powell | LSAWA WG Smith |  | LSAWA GDWells | LSAWA GA Mawhinney | LSRO MJ Ploenges |  | LSRO PR Wrigley | LSCK GS Walsh | LSMT PI Bopf |  | LSMT PJ Bennett | LSEW AJ Kennedy | LSET NS Leach |  | LSEW AJ Henry † | LSMT BT Elstone | LSMT BS Warton |  | ABAWA DW Croke | ABAWA RA Wilkinson | ABAWA KR Murphy |  | ABAWA IF Crouch | ABAWA C Dickson | ABAWA GS Thomms |  | ABMT RJ Driscoll | ABMT RF Scott ABMT | DJ Priestly |  | ABMT KR Howell | ABMT DJ Walker | ABMTMP Young |  | ABMT TD Manwaring | ABMT MR Bournes | ABMT MB Slater |  | ABET JE Thrift | ABET SL Robson | ABET MA Wernas |  | ABET SA Loynes | ABCK SJ Carman | ABCK SB Rowell |  | ABCK MG Ollet |  |  |  |  | † On Eternal Patrol |  |  |  
				    
				  
				   	 | LCDR CAB Nixon-Eckersall RN | 11 February 1969 |  |  |  LCDR DPR Ryan RN | 16 June 1971 |  |  | LCDR IDG Mc Dougall RAN | 31 December 1971 |  |  | LCDR RRH Fayle RAN | 07 August 1973 |  |  | LCDR PW Horobin RAN | 29 November 1974 |  |  | LCDR ASL Smith RN | 10 January 1975 |  |  | Decommissioned | 14 January 1975 |  |  | LCDR ASL Smith RN | 01 February 1977 |  |  | LCDR GD Anderson RAN | 26 May 1978 |  |  | LCDR KF Pitt RAN | 05 July 1979 |  |  | LCDR JAC Miers RN | 15 August 1980 |  |  | LCDR AB Parkin RAN | 27 May 1981 |  |  | Decommissioned | 30 September 1982 |  |  | LCDR DW Mole RAN | 16 April 1984 |  |  | LCDR DM Forbes RN | 28 October 1985 |  |  | LCDR BL Beveridge RAN | 06 March 1987 |  |  | LCDR JN Edgell RN | 14 March 1988 |  |  | LCDR BG Anderson RAN | 15 December 1989 |  |  | LEUT IR Bray RAN | 04 March 1990 |  |  | Decommissioned | 05 May 1990 |  |  | LCDR IR Bray RAN | 13 December 1992 |  |  | LCDR MA Sander RAN | 15 November 1994 |  |  | LCDR SG Dalton RAN | 01 April 1996 |  |  | LCDR SPM O'Dwyer RAN | 07 October 1997 |  |  | Decommissioned | 29 March 1999 |  |  |    ONSLOW BOI Report ONSLOW BOI |