HMS L9 was an L-class submarine of the Royal Navy, built during the First World War by William Denny and Brothers at Dumbarton, Scotland. She was laid down in October 1916, launched on 29 January 1918, and commissioned on 27 May 1918.
Design
L9 belonged to the improved group of L-class submarines designed to carry the newer 21-inch torpedoes and additional fuel. She displaced 914 tons on the surface and 1,089 tons submerged, carried a crew of 38, and was armed with:
- Four 21-inch bow torpedo tubes
- Two 18-inch beam torpedo tubes
- One 4-inch deck gun
She could reach 17 knots on the surface and 10.5 knots submerged.
First World War Service
Although commissioned during the final months of the First World War, HMS L9 saw little if any operational combat before the Armistice in November 1918. Like many late-war submarines, she entered service too late to make a significant wartime contribution.
Service in the Far East
In 1919, L9 sailed to Hong Kong with the depot ship HMS Ambrose as part of the Royal Navy's 4th Submarine Flotilla. She spent much of her career on the China Station, helping maintain Britain's naval presence in East Asian waters during the interwar years.
Typhoon Sinking
One of the most dramatic episodes in her career occurred on 18 August 1923, when a powerful typhoon struck Hong Kong Harbour. During the storm, HMS L9 sank in the harbour.
Unlike many submarine losses, this did not mark the end of her career. She was successfully raised from the bottom on 6 September 1923, repaired, and recommissioned for further service.
Disposal
By the mid-1920s, the L-class boats were becoming obsolete as newer submarine designs entered service. After several more years in the Far East, HMS L9 was sold in Hong Kong for scrap on 30 June 1927.
Significance
HMS L9 is notable for:
- Being one of the improved wartime L-class submarines.
- Serving with the Royal Navy's submarine force in the Far East after World War I.
- Sinking during the 1923 Hong Kong typhoon and subsequently being salvaged and returned to service.
- Completing her career without being lost in combat.
Key Facts
- Name: HMS L9
- Class: L-class submarine
- Builder: William Denny and Brothers, Dumbarton
- Commissioned: 27 May 1918
- Base: Hong Kong with the 4th Submarine Flotilla
- Sank: During a typhoon on 18 August 1923
- Salvaged: 6 September 1923
- Sold for scrap: 30 June 1927
