HMAS Otama

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HMAS Otama sub.jpg
Otama in Western Port Bay in June 2011

Coordinates: 38°20′30.3″S 145°13′26.2″E / 38.341750°S 145.223944°E / -38.341750; 145.223944

Builder: Scotts Shipbuilding and Engineering Company
Laid down: 25 May 1973
Launched: 3 December 1975
Commissioned: 27 April 1978
Decommissioned: 15 December 2000
Motto: "Unseen We Seek"
  • One of the "Mystery Boats"
  • The "Gucci Boat"
Status: Decommissioned
General characteristics
Class & type: Oberon-class submarine
  • 1,610 tons standard
  • 2,030 tons surfaced
  • 2,410 tons submerged
Length: 295.2 ft (90.0 m)
Beam: 26.5 ft (8.1 m)
Draught: 18 ft (5.5 m)
  • 2 × Admiralty Standard Range supercharged V16 diesel generators
  • 2 × English Electric motors
  • 3,500 bhp, 4,500 shp
  • 2 shafts
  • 12 knots (22 km/h; 14 mph) surfaced
  • 17 knots (31 km/h; 20 mph) submerged
  • 11 knots (20 km/h; 13 mph) at snorkel depth
Range: 9,000 nautical miles (17,000 km; 10,000 mi) at 12 knots (22 km/h; 14 mph)
Test depth: 200 metres (660 ft)
  • As launched:
  • 8 officers, 56 sailors
  • At decommissioning:
  • 8 officers, 60 sailors
Sensors and
processing systems:
  • Sonar:
  • Atlas Elektronik Type CSU3-41 bow array
  • BAC Type 2007 flank array
  • Sperry BQG-4 Micropuffs rangefinding array
  • Sonartech PIPRS intercept processor
  • Radar:
  • Kelvin Hughes Type 1006
  • Torpedo tubes:
  • 6 × 21-inch (53 cm) bow tubes
  • 2 × short-length 21-inch (53 cm) stern tubes (later removed)
  • 1996 payload: Mix of 20:
  • Mark 48 Mod 4 torpedoes
  • UGM-84 Sub Harpoon missiles

HMAS Otama (SS 62/SSG 62) was an Oberon-class submarine of the Royal Australian Navy (RAN). Built in Scotland, the submarine was the last of the class to enter service when commissioned into the RAN in 1978. One of two Australian "Mystery Boats" fitted with additional surveillance and intelligence-gathering equipment, Otama was routinely deployed on highly-classified operations to track units of the Soviet Pacific Fleet and conduct surveillance throughout Asia.

The submarine was part of the RAN's largest flag-showing cruise in the Indian Ocean during 1980. From 1983 to 1985, she underwent an extensive upgrade. In 1987, two submariners died when Otama submerged while they were still working in the fin. Otama remained in service until late 2000; a delay from her original planned decommissioning date to help attenuate the problems with the replacement Collins-class submarines.

Otama was sold to the Western Port Oberon Association in 2001, who planned to preserve her as a museum vessel as part of the proposed Victorian Maritime Centre. Submissions to build the maritime museum at various locations on the Mornington Peninsula were repeatedly rebuffed. In late 2008, the submarine was listed for sale on eBay, but despite several expressions of interest, Otama was not sold. In-principle approval to build the Victorian Maritime Centre on reclaimed land adjacent to the Western Port Marina at Hastings was granted in 2013, but as of 2015, planning permits have not been approved.

Design and construction[edit]

The Oberon class was based heavily on the preceding Porpoise-class of submarines, with changes made to improve the vessels' hull integrity, sensor systems, and stealth capabilities.[1] Eight submarines were ordered for the RAN, in two batches of four.[2] The first batch was approved in 1963, and the second batch (including Otama) was approved during the late 1960s, although two of these were cancelled before construction started in 1969, with the funding redirected to the Fleet Air Arm.[3][4] This was the fourth time the RAN had attempted to establish a submarine branch.[5]

The submarine is 295.2 feet (90.0 m) long, with a beam of 26.5 feet (8.1 m), and a draught of 18 feet (5.5 m) when surfaced.[6] At full load displacement, she displaces 2,030 tons when surfaced, and 2,410 tons when submerged.[6] The two propeller shafts are each driven by an English Electric motor providing 3,500 brake horsepower and 4,500 shaft horsepower; the electricity for these is generated by two Admiralty Standard Range supercharged V16 diesel generators.[7] The submarine could travel at up to 12 knots (22 km/h; 14 mph) on the surface, and up to 17 knots (31 km/h; 20 mph) when submerged, had a maximum range of 9,000 nautical miles (17,000 km; 10,000 mi) at 12 knots (22 km/h; 14 mph), and a test depth of 200 metres (660 ft) below sea level.[6][7] When launched, the boat had a company of 8 officers and 56 sailors, but by the time she decommissioned, the number of sailors had increased to 60.[6][7] In addition, up to 16 trainees could be carried.[7]

The main armament of the Oberons consisted of six 21-inch (533.4 mm) torpedo tubes.[1] The British Mark 8 torpedo was initially carried by the submarine; this was later replaced by the wire-guided Mark 23.[8] After a multi-year refit ending in 1985, Otama was upgraded to carry United States Navy Mark 48 torpedoes and UGM-84 Sub Harpoon anti-ship missiles; the last Australian Oberon to undergo the Submarine Weapon Update Program.[5][9][10] As of 1996, the standard payload of an Australian Oberon was a mix of 20 Mark 48 Mod 4 torpedoes and Sub Harpoon missiles.[6] Some or all of the torpedo payload could be replaced by Mark 5 Stonefish sea mines, which were deployed through the torpedo tubes.[6][8] On entering service, two stern-mounted, short-length 21-inch (53 cm) torpedo tubes for Mark 20 anti-submarine torpedoes.[11] However, the development of steerable wire-guided torpedoes made the less-capable aft-firing torpedoes redundant; they were closed off, and later removed during a refit.[11]

Otama was laid down by Scotts Shipbuilding and Engineering Company at Greenock, Scotland on 25 May 1973, launched on 3 December 1975, and commissioned into the RAN on 27 April 1978.[9] The submarine was due to enter service in 1976, but faulty high-power electrical cabling had been installed in Otama and sister boat Orion; stripping out and replacing the cabling delayed each submarine's construction by two years.[12] The delay meant that the two boats could be fitted with Micropuffs rangefinding sonar during construction, and have additional electronic surveillance equipment installed.[13] Otama was the sixth and final Oberon-class submarine to enter service with the RAN.[14] The boat's name comes from a North Queensland Aboriginal word meaning "dolphin"; this was a break in RAN tradition, which had used the names of explorers and pioneers for previous submarines.[15][16] Otama was assigned the pennant number 62.[17] The high standard of internal fittings compared to the rest of the class led to the "Gucci Boat" nickname.[18]

Operational history[edit]

After a delivery voyage via ports in Denmark, Florida, and Mexico, Otama arrived at HMAS Platypus in Sydney on 15 December 1979.[19]

As Otama and Orion were fitted with specialist intelligence-gathering equipment, they were regularly deployed on surveillance and spying operations, earning them the nickname "Mystery Boats".[20][21] Activities were part of the broader Western nations' intelligence-gathering apparatus, and included surveillance off the coasts of China, India, Vietnam, and Indonesia, tailing of Soviet Pacific Fleet units during operations in the Pacific and Indian Oceans, and observation off the Soviet base at Vladivostok.[20][21] These activities continued until the end of the Cold War in 1992, and most of Otama‍ '​s activities and deployments during this period remain classified.[20]

In April 1980, Otama and the destroyer Hobart were sent to Fiji as part of Australia's response to Tropical Cyclone Wally.[22] On 8 September 1980, Otama joined five other RAN vessels to form the Australia Squadron.[23] The Squadron, which included HMA Ships Melbourne, Perth, Derwent, Stalwart, and Supply spent two months in the Indian Ocean as part of a flag-showing cruise; the largest RAN deployment since World War II.[23][18]

In July 1983, Otama was docked for modernisation.[24] The Submarine Weapon Update Program refit lasted until 1985.[24]

On 3 August 1987, two sailors were killed aboard Otama. At 09:00, the submarine left HMAS Platypus to test a new towed hydrophone array.[25] Extreme weather forced the cancellation of the test, and two sailors were sent into the fin at around 10:20 to retrieve and stow the array.[25] At 10:35, the submarine was prepared for diving, and she submerged four minutes later, with the two men still in the fin.[25] The submariners, on noticing their vessel diving underneath them, climbed up the fin to the bridge and opened the voicepipe in an unsuccessful attempt to contact the control room before being washed overboard.[26] Their absence was not noticed until around 11:00, despite post-dive checks and a rotation of duty stations in the interim, and was not confirmed for at least another half hour.[25] A search for the submariners was conducted: one of the bodies was spotted, but unable to be recovered.[26] Estimated survival time in the prevailing conditions was only five minutes, and the submariners were not required to wear lifebelts.[26] A naval board of inquiry recommended that action be taken against two officers, although the Navy Office did not take action, as there were multiple factors leading into the incident, and court martialing the two officers could find one or both held solely responsible for the deaths.[27] In addition to the rejection of the board's findings, several officers (including the two singled out by the inquiry), were promoted.[28] A coronial inquiry followed (one of the first heard by the new office of the State Coroner of New South Wales), to which there was some opposition by the RAN, including advising personnel not to cooperate with the task force gathering evidence for the inquiry, and attempting to fend off a request by the coroner for a trip on the submarine replicating the events of the day.[27] Following two separate weeks of hearings in October and November 1988, the state coroner concluded that the incident was the sum of multiple moderate-to-minor breaches of operating procedure and careless negligence (including that notices indicating personnel were outside the submarine were not posted, and key personnel were not informed) aboard a submarine operating in non-standard conditions (such as the testing of new equipment, along with observers and trainees aboard, and a high rotation of personnel between stations in a short period of time).[29] The coroner singled out Otama‍ '​s commanding officer for allowing so many rules and procedures to be ignored under his command, but did not find sufficient cause to recommend charges against any individual.[30] Several changes were made to casing operational procedures at sea, including making lifebelts compulsory and requiring the senior petty officer on duty to sign out and sign back in personnel working outside.[31] The fatalities aboard Otama were two of the only three deaths aboard Australian Oberons.[32]

At the end of March 1999, Otama was reassigned to HMAS Stirling in Western Australia, where the Collins-class submarines were operating from.[33][34] Within days of leaving Sydney, sister boat Onslow was paid off, leaving Otama the only one of her class in service, and the submarine base at HMAS Platypus was cleared for closure.[33][34]

Decommissioning and fate[edit]

Otama paid off on 15 December 2000: problems with the introduction of the Collins-class submarines kept Otama and sister boat Onslow in service for several years beyond their planned decommissioning date.[35][36] In the year leading up to her paying off, the pending decommissioning combined with the findings of the McIntosh-Prescott Report to cause the "Fast Track" program, A$1 billion of modifications to make Dechaineux and Sheean fit for service by the end of the year.[37] Otama was the last Australian Oberon to leave service.[38]

The submarine was sold in 2001 to the Western Port Oberon Association, a community group intending to preserve her as museum vessel and building the Victorian Maritime Centre in Hastings, Victoria.[39][40] The association beat 32 other tenders for the disposal of Otama, and received a $500,000 "Centenary of Federation" grant from the federal government to fund the purchase and relocation.[16][41] The grant included the $50,000 purchase price of the submarine, plus $300,000 to tow Otama from Fremantle to Western Port Bay, with the balance to be used in bringing the boat ashore once a suitable venue was built.[16][41][42] Otama arrived in Western Port Bay in 2002, where she was moored while waiting for the approval and development of the museum..[40]

By late 2008, plans for three separate locations for the Victorian Maritime Centre - Hastings, Crib Point, and Stony Point - were all knocked back by the Department of Sustainability and Environment.[39][40][43] As the Western Port Oberon Association could no longer afford to maintain the submarine while waiting for a favourable decision, Otama was listed on eBay for sale in November 2008.[40][44][45][46] Although no bids were placed by the time the online auction closed in late December, the association received several expressions of interest: including from the St Kilda Marina, Frankston City Council, and one purporting to be a tourism operator but believed by the Western Port Oberon Association to be wanting to restore the submarine for drug smuggling (which was referred to the Australian Federal Police and the Australian Security Intelligence Organisation).[39][43][47] No sale was made, and the submarine remained in the possession of the association.

In early 2010, Otama‍ '​s interior was used to represent a Russian submarine for the short film Deeper Than Yesterday.[48] The 20-minute film won awards at the 2010 Australian Film Institute Awards, the 2010 Leeds International Film Festival, and the 2011 Sundance Film Festival.[48][49]

In-principle approval to build the Victorian Maritime Centre was given by Victorian environmental minister Ryan Smith in March 2013.[42] The association submitted plans in June for a 2.5-hectare (6.2-acre) site on the seawall of the Western Port Marina at Hastings, to be built on reclaimed land.[42] The proposed site is on the outer edge of the existing seawall, with Otama enclosed in a semi-recessed concrete pit designed to support the main internal deck at ground level, located between the seawall and the planned site of the maritime centre.[42] As of February 2015, design work has been completed, but the association was awaiting the approval of a planning permit.[50]


  1. ^ a b Chant, A Compedium of Armaments and Military Hardware, pp. 167–8
  2. ^ Cooper, in Stevens, The Royal Australian Navy, p. 188
  3. ^ Cooper, in Stevens, The Royal Australian Navy, p. 194
  4. ^ Bastock, Australia's Ships of War, p. 394-5
  5. ^ a b Dennis et al., The Oxford Companion to Australian Military history, p. 399
  6. ^ a b c d e f Sharpe (ed.), Jane's Fighting Ships, 1996–1997, p. 23
  7. ^ a b c d Shaw, HMAS Onslow, p. 15
  8. ^ a b Shaw, HMAS Onslow, p. 21
  9. ^ a b Sharped (ed.), Jane's Fighting Ships 1992–93, p. 22
  10. ^ Owen, in Mitchell, Australian Maritime Issues 2010, p. 32
  11. ^ a b Shaw, HMAS Onslow, p. 19
  12. ^ Owen, in Mitchell, Australian Maritime Issues 2010, p. 31
  13. ^ Owen, in Mitchell, Australian Maritime Issues 2010, p. 32-3
  14. ^ Stevens, in Stevens, The Royal Australian Navy, opp. p. 32
  15. ^ Bastock, Australia's Ships of War, p. 394
  16. ^ a b c Nelson, Australian Submarine History Lands at Hastings with $500 000 Centenary of Federation Grant (press release)
  17. ^ Gillett, Australian and New Zealand Warships since 1946, p. 77
  18. ^ a b Seal & Blake, Century of Silent Service, p. 83
  19. ^ H.M.A.S. OTAMA COMES HOME Manufacturing strengthens, in The Canberra Times
  20. ^ a b c Owens, in Centenary of Australian Submarines, pp. 103-5
  21. ^ a b Seal & Blake, Century of Silent Service, p. 85
  22. ^ CYCLONE DAMAGE Fiji's PM appeals to nation for help, in The Canberra Times
  23. ^ a b Lind, The Royal Australian Navy, p. 297
  24. ^ a b Gillett, Australian and New Zealand Warships since 1946, p. 76
  25. ^ a b c d Waller, Suddenly Dead, p. 6
  26. ^ a b c Waller, Suddenly Dead, p. 7
  27. ^ a b Waller, Suddenly Dead, pp. 3–4
  28. ^ Waller, Suddenly Dead, p. 10
  29. ^ Waller, Suddenly Dead, pp. 5-10
  30. ^ Waller, Suddenly Dead, pp. 8-9
  31. ^ Waller, Suddenly Dead, pp. 7, 10
  32. ^ Owen, in Centenary of Australian Submarines, p. 105
  33. ^ a b Owens, in Centenary of Australian Submarines, pp. 103-4
  34. ^ a b Subs leave harbour behind, The Daily Telegraph, p. 4
  35. ^ Jones, in Stevens, The Royal Australian Navy, pp. 276–7
  36. ^ Yule & Woolner, The Collins Class Submarine Story, pp. 288–9
  37. ^ Yule & Woolner, The Collins Class Submarine Story, pp. 288–9
  38. ^ Owen, in Centenary of Australian Submarines, p. 93
  39. ^ a b c Stewart, ASIO eyes mystery group after attempt to buy sub
  40. ^ a b c d Cogdon, Submarine for sale on internet auction website eBay
  41. ^ a b Silkstone, Sub group fights battle of Hastings
  42. ^ a b c d Hast, Sub ashore in 18 months
  43. ^ a b Stewart, Submarine for sale as group's dream sinks in a sea of red tape
  44. ^ Seal & Blake, Century of Silent Service, p. 84
  45. ^ Clifton-Evans, Is eBay the answer?
  46. ^ College & Warlow, Ships of the Royal Navy, p. 291
  47. ^ Submarine fails to sell on Ebay, in The Shipping Times
  48. ^ a b Bodey, Red carpet unrolls, but Cannes gives local filmmakers short shrift
  49. ^ Tourtellotte, Sundance's unheralded short film and grant winners
  50. ^ Taylor, Wyuna heads to Docklands


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