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| HMS M2 | |
|---|---|
| Ship name | HMS M2 |
| Ship class | M-class submarine (monitor conversion) |
| Ship builder | Vickers Armstrong |
| Ship launched | 1919 |
| Ship completed | 1920 |
| Ship displacement | 1,400 long tons (surfaced, as monitor) |
| Ship length | 265 ft (80.8 m) |
| Ship beam | 26 ft (7.9 m) |
| Ship draft | 12 ft (3.7 m) |
| Ship propulsion | Diesel engines; electric motors; later diesel-electric modifications |
| Ship speed | 12 kn (surfaced, as submarine); 8 kn (as monitor with deck gun) |
| Ship range | 3,000 nmi at 8 kn (as submarine) |
| Ship complement | 60–70 |
| Ship armament | 12-inch (305 mm) BL Mk X gun in turret (monitor conversion); torpedo tubes |
| Ship notes | Submarine converted to submarine-monitor with single 12-inch gun; sank 1932 with loss of all hands |
HMS M2 HMS M2 was a Royal Navy submarine of the post-World War I Royal Navy M-class program, notable for conversion into a submarine monitor armed with a single 12-inch gun. Conceived amidst interwar naval armament experimentation and emerging submarine warfare doctrine, the vessel embodied a hybrid approach linking capital-ship firepower and underwater concealment. M2 served in trials and patrols before a fatal loss in 1932 that became the focus of inquiries within Admiralty circles and contemporary press.
M2 originated from Admiralty requirements developed during meetings involving First Sea Lord advisers and technical bureaus at Admiralty headquarters, responding to studies by Director of Naval Construction staff and designers at Vickers-Armstrongs works in Barrow-in-Furness. The hull followed the M-class submarine lineage laid down under postwar programmes influenced by experiences at Jutland and operational analysis from Grand Fleet patrols. Construction incorporated heavy structural reinforcement and a watertight mounting for a single 12-inch BL Mk X gun turret derived from Queen Elizabeth-class battleship ordnance practice, supervised by ordnance officers from Woolwich Arsenal and gunnery specialists who had worked on HMS Furious conversions. The vessel was launched at the Vickers-Armstrongs yard in 1919 and completed in 1920 after prolonged fitting-out involving naval architects from Department of Naval Construction and submarine engineers drawn from Submarine Service training establishments.
The submariner hull maintained double-hull elements informed by Holland-class and K-class experience, with modifications to accept the heavy gun turret and magazine. Displacement figures reflected the weight of the gun and turret similar to contemporary monitors such as HMS Erebus and HMS Terror, while propulsion comprised diesel engines and electric motor sets akin to those installed in E-class and L-class submarines. Diving depth was limited by the reinforced forward structure, and endurance mirrored cruiser-derived patrol expectations tested during trials with officers from Submarine Flotilla staffs onboard. Crew complements included ratings trained at HM Dockyard Devonport and specialists from Royal Corps of Naval Constructors. The integration of torpedo armament retained tubes compatible with Mark VIII torpedo handling gear used across the fleet.
Following commissioning, M2 joined flotillas participating in peacetime exercises coordinated with Atlantic Fleet squadrons and coastal defence units around Scapa Flow and the Western Approaches. She conducted gunnery trials and shock tests overseen by officers from Admiralty Experimental Station and collaborated with naval aviation elements from Royal Air Force maritime patrol units. Operations featured live-fire trials at ranges used by Dartmouth and Portsmouth establishments; the vessel’s capabilities were evaluated against scenarios drawn from postwar contingency planning discussed at Imperial Defence Conference sessions. M2 also took part in training cruises with submarine depot ships from Rosyth and occasional port visits to Gibraltar and Malta, reflecting strategic interests in the Mediterranean.
The defining modification was the installation of the 12-inch turret, which required deck reinforcement, altered ballast arrangements, and a redesigned forward pressure hull. Armour and structural changes paralleled practices from monitor conversions undertaken at Chatham Dockyard and Devonport Dockyard, supervised by engineers who had worked on HMS Glorious and other capital-ship alterations. Subsequent refits addressed seaworthiness issues highlighted during trials, incorporating changes to the gun breech interfaces and ammunition handling systems derived from procedures at Royal Arsenal. Additional electrical and pumping systems were added to manage flooding risks associated with above-deck ordnance, drawing on lessons from salvage work conducted after World War I collisions and sinkings.
Operational service included routine trials and a number of incidents that prompted Admiralty reports. During early live-fire trials, shell dispersion and stabilization challenges were noted, leading to adjustments in training overseen by Gunnery School instructors. Mechanical problems with ventilation and magazine flooding procedures were recorded in logbooks submitted to the Naval Staff and discussed in internal briefings referencing salvage precedents such as the sinking of HMS K4 and crew safety measures developed after Q-ship encounters. The cumulative effect of these incidents influenced operational restrictions placed on specialized vessels in fleet exercises conducted with participation from commanders of Home Fleet units.
In 1932, while on a surfaced transit and exercising procedures connected to torpedo and gunnery drills, M2 was lost with all hands. The disappearance prompted an investigation by boards convened under the Admiralty and attracted scrutiny in Parliament during questions raised by members of House of Commons. Salvage attempts and subsequent inquiries referenced precedents such as the specialist recovery operations at Loch Ewe and the legal framework applied in cases investigated by Board of Inquiry panels. The loss contributed to reassessment of hybrid warship concepts and informed later policy decisions affecting submarine design adopted by the Royal Navy leading into the rearmament period prior to Second World War preparations. The wreck remains a matter of historical and archaeological interest referenced in works dealing with interwar naval experimentation and the evolution of submarine doctrine.
Category:Submarines of the Royal Navy Category:Shipwrecks of the United Kingdom