X-class submarine

X-class submarine. The X-class was a series of midget submarines built for the Royal Navy during the Second World War. Designed for clandestine attack missions against high-value enemy targets, these small craft were operated by crews of four and played a significant role in several daring special operations. Their most famous actions involved attacks on major Kriegsmarine warships, including the German battleship Tirpitz.

Development and design

The concept for the X-class emerged from earlier midget submarine experiments, such as the Welman submarine and the Chariot manned torpedo. Developed under great secrecy, the primary design requirement was to carry two large, detachable side charges packed with Amatol high explosive, each weighing over two tons. The vessels were constructed by firms including Vickers-Armstrongs at Barrow-in-Furness and Broadbent in Sheffield. The design featured a cylindrical pressure hull with a small conning tower and was equipped with a periscope, diesel engine for surface transit, and a quiet electric motor for submerged approach. Life support was minimal, with crews enduring extremely cramped conditions during long towed transits by larger submarines like the T-class to their operational areas.

Operational history

The operational debut of the X-class came with Operation Source in September 1943, an audacious attack on German capital ships in Norwegian fjords. HMS X6 and HMS X7 successfully placed charges beneath the Tirpitz in Kåfjord, causing significant damage that rendered the battleship non-operational for months. HMS X5 was lost during the same attack, presumed sunk while targeting the Scharnhorst. In April 1944, HMS X24 undertook Operation Guidance, penetrating the heavily defended port of Bergen to sink the German cargo ship Bärenfels. Later, in September 1944, the same vessel returned to Bergen during Operation Heckle and successfully destroyed a large floating dock. Other craft were deployed to the Mediterranean Sea, supporting preparations for the Allied invasion of Sicily and the Landings at Anzio. Operations were perilous, with several submarines, including HMS X8, HMS X9, and HMS X22, lost to accidents or enemy action during training and transit.

Variants

The initial production model was the X-3 type, which set the standard configuration. This was followed by the improved X-4 type, which featured minor modifications. The most significant variant was the XT-class (Training), a non-operational version used for crew instruction. The final evolution was the XE-class, designed for service in the Pacific War. The XE-class boats, such as HMS XE1, were slightly larger, had improved equipment, and achieved notable successes, including HMS XE3's damaging of the Japanese cruiser Takao during Operation Struggle in Singapore's Johor Strait in July 1945.

Specifications

For the standard X-class submarine, the length was approximately 51 feet, with a beam of just under 6 feet. Surface displacement was around 27 tons, increasing to 30 tons submerged. Propulsion was provided by a single 42 bhp Gardner diesel engine for surface running, coupled with a 30 hp electric motor for silent submerged operations. Surface speed was roughly 6.5 knots, while submerged speed was about 5.5 knots. The operational range was limited to 500 nautical miles on the surface when towed by a "mother" submarine. Armament consisted of the two main side charges and sometimes small demolition charges. The complement was one commanding officer, one pilot, and two divers.

Legacy and preserved examples

The X-class demonstrated the strategic impact of special forces and midget submarine operations, influencing postwar designs in several navies. Their daring raids remain celebrated in the history of the Royal Navy Submarine Service. One complete example, HMS X24, is preserved as a museum ship at the Royal Navy Submarine Museum in Gosport. The Imperial War Museum Duxford holds the conning tower and other sections of HMS X5. The legacy of their Pacific counterparts, the XE-class, is honored at the Royal Navy Heritage Centre.

Category:Midget submarine classes Category:World War II submarines of the United Kingdom