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| HMS Sidon | |
|---|---|
| Ship name | HMS Sidon |
| Ship class | Submarine depot ship / torpedo trials vessel |
| Ship builder | Vickers-Armstrongs |
| Ship launched | 1919 |
| Ship commissioned | 1919 |
| Ship decommissioned | 1955 |
| Ship out of service | 26 June 1955 |
| Ship fate | Sunk in accidental explosion; wreck demolished |
| Ship displacement | ~13,300 tons (full load) |
| Ship length | 468 ft |
| Ship beam | 64 ft |
| Ship propulsion | Steam turbines |
| Ship speed | 15 kn |
HMS Sidon was a Royal Navy vessel converted from a First World War–era cruiser hull that served as a submarine depot ship and later as a torpedo trials platform. Built by Vickers-Armstrongs and commissioned in the immediate post‑World War I era, she operated through interwar refits and World War II support roles before suffering a catastrophic internal explosion in 1955 while attached to Portsmouth operations. The disaster prompted inquiries involving the Admiralty, Royal Navy, and scientific agencies, influencing subsequent torpedo safety protocols and naval engineering standards.
Sidon was laid down at the Newcastle upon Tyne yards of Vickers-Armstrongs from a hull lineage tracing to late World War I cruiser designs. The conversion programme reflected interwar constraints under the Washington Naval Treaty environment and postwar naval planning by the Admiralty and Naval Staff. Her machinery comprised steam turbine sets derived from contemporary battlecruiser practice, aiming for a service speed compatible with flotilla support roles defined by the Home Fleet and Mediterranean Fleet operational doctrines. Armament and superstructure were altered to accommodate heavy workshop spaces, torpedo storage, and submarine support equipment used by the Submarine Service and Fleet Air Arm liaison teams.
Commissioned in 1919, Sidon operated as a depot ship for units attached to HMS Dolphin, the principal Royal Navy submarine base at Gosport, and supported flotillas assigned to the Atlantic Fleet and Home Fleet during peacetime cruises and fleet exercises such as those held at Scapa Flow and the Atlantic Charter era manoeuvres. During World War II she performed repair, spare parts supply, and refit functions supporting boats from the 7th Submarine Flotilla and liaison with shore establishments including Portsmouth Dockyard and Devonport. Postwar, Sidon was repurposed for experimental work under the auspices of the Admiralty Research Establishment and coordinated with wartime engineering teams from Armament Research groups to evaluate the Mark 12 torpedo series and emerging electric and steam torpedo technologies.
On 16 June 1955, while moored in Portsmouth Harbour and conducting trials with a Mark 12 anti‑ship torpedo, an internal detonation occurred within one of the torpedo warheads aboard Sidon. The explosion ripped through her hull, causing a rapid loss of buoyancy and resulting in the vessel sinking on 19 June 1955 with significant damage and multiple fatalities among personnel assigned from the Royal Navy Torpedo Branch and civilian contractors from Armament Research. Emergency responses involved harbour units from HMS Vernon, salvage teams from No. 7 Salvage Unit and tugboats from Portsmouth Dockyard, while medical evacuation used ambulances coordinated with Royal Naval Hospital Haslar and Queen Alexandra's Royal Naval Nursing Service personnel.
The Admiralty convened a Board of Inquiry that included representatives from the Royal Engineers, Royal Electrical and Mechanical Engineers, and scientists from the Admiralty Research Establishment and Ministry of Supply. Investigators examined possible causes including spontaneous warhead detonation, torpedo motor malfunction, and handling errors linked to procedures established under the Torpedo Branch manuals. The inquiry findings led to revised handling protocols, enhanced safety interlocks similar to those applied in HMS Vanguard munitions reviews, and technical changes in warhead design influenced by prior incidents such as those studied after World War II ordnance accidents. Legal and compensation matters engaged the Admiralty Law Division and parliamentary questions in the House of Commons addressing service casualty procedures and dockyard safety oversight.
The sinking of Sidon prompted memorials acknowledging the loss at Portsmouth and commemorations within the Submarine Service and Royal Navy communities, including plaques at St Thomas' Church, Portsmouth and remembrance events involving associations such as the Royal Naval Association and the Submarine Old Comrades Association. Technical lessons influenced later generations of torpedo design and ordnance safety reviewed by the Defence Science and Technology Laboratory successors, with training revisions incorporated into curricula at HMS Excellent and Royal Navy Engineering College programs. Sidon's wreck and demolition remain part of studies in maritime archaeology and naval heritage discussions hosted by the National Museum of the Royal Navy and local Portsmouth Historic Dockyard initiatives.
Category:Royal Navy shipwrecks Category:Ships built by Vickers-Armstrongs Category:Accidental explosions