| Built By: | Greenock & Grangemouth Dockyard |
| Build Group: | Cameron-class |
| Fate: | Placed on the Disposal List in 1948. She was sold to the Clan Line and, after conversion back to a mercantile role, deployed in trade until sold during 1963 for demolition at Hong Kong. |
Midget Submarine Depot ship built for mercantile use by the Clan Line and purchased by the Admiralty in 1942. The ship was launched on 27th October 1942 by Greenock Shipyard and when completed was converted for use as a Depot Ship by Scotts of Greenock. Commissioned on 26th January 1943 she was named HMS Bonaventure and was the 11th RN ship to carry the name, introduced in 1489. The name had previously been used by a DIDO Class cruiser launched in 1939 and completed in May 1940. The cruiser was sunk by Italian submarine ABRA north of Sollum on 31st March 1941.
On completion of trials took passage to Loch Striven on west bank of Clyde for service as main training base and depot ship for midget submarines ("X" Craft). During this passage and trials crews of Midget submarines X5, X6, X7, X8, X9 and X10 were prepared for an operation to attack the German battleship Tirpitz in Altenfjord, Norway.
21st Feb, 1945, Embarked six XE class and took passage to Australia via Panama.
March 7th, arrived at Pearl Harbour. Attitude of US Navy was most discouraging and the use of this type of submarine was not looked on with any enthusiasm.
April 27th, 1945, arrived at Brisbane and in May moved on to Townsville, Queensland where a visit by Senior Officer 14th Flotilla to US Navy Base at Subic Bay did not improve the situation and it was suggested that the ship be used in Fleet Train after conversion for a wider support role. A proposal was made to use midget submarines for cutting Japanese telegraph cables.
The idea was to isolate Singapore from Japan by direct telephone cable traversing Indo China and Hong Kong just before an invasion by a joint force. Four XE Craft were designated for operations.
In June, transferred to Hervey Bay, Queensland (250 miles from Brisbane ) and thence to south of Townsville) to prepare for cable cutting operations. Carried out extensive training and experiments in Hervey Bay using a disused telegraph cable between Australia and New Guinea during which two divers lost their lives by oxygen poisoning.
Operational targets were selected and approved and Bonaventure made passage from Hervey Bay to Labuan, Borneo.
Operations in July included:
All operations were successful. These successes were not clear at the time but, at the ending of the war in the Far East in August, they were confirmed. Hush Hush till the bitter end.
20th Aug, returned to Sydney
Returned to UK from Australia and was retained in RN service until placed on the Disposal List in 1948. She was sold to the Clan Line and after conversion back to a mercantile role deployed in trade until sold during 1963 for demolition at Hong Kong.
The most decorated ship in the Royal Navy, winning:
Totalling 68. Also: Over 100 mentioned in Dispatches were logged.
| 27-10-1942 | Launched by Greenock Shipyard, and when completed, was converted for use as a depot ship by Scotts of Greenock. |
| 25-01-1943 | Commissioned for RN service. |
| 22-01-1944 | Completed refit and re-commissioned for service with the British Pacific Fleet. |
| 21-02-1945 | Embarked six XE class and took passage to Australia via Panama. |
| 07-03-1945 | Arrived at Pearl Harbour. |
| 27-04-1945 | Arrived at Brisbane |
| 20-08-1945 | Arrived at Sydney |
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