Japanese submarine I-24 (1939)

The Japanese submarine I-24 was one of five Type C cruiser submarines of the C1 sub-class built for the Imperial Japanese Navy (IJN) during the 1930s.

Empire of Japan
Name: I-24
Builder: Sasebo Naval Arsenal
Laid down: 5 December 1938
Launched: 12 November 1939
Commissioned: 31 October 1941
Struck: 1 August 1943
Fate: Sunk, 11 June 1943
General characteristics
Class and type: Type C1 submarine
  • 2,595 tonnes (2,554 long tons) surfaced
  • 3,618 tonnes (3,561 long tons) submerged
Length: 109.3 m (358 ft 7 in) overall
Beam: 9.1 m (29 ft 10 in)
Draft: 5.3 m (17 ft 5 in)
Installed power:
  • 23.5 knots (43.5 km/h; 27.0 mph) surfaced
  • 8 knots (15 km/h; 9.2 mph) submerged
  • 14,000 nmi (26,000 km; 16,000 mi) at 16 knots (30 km/h; 18 mph) surfaced
  • 60 nmi (110 km; 69 mi) at 3 knots (5.6 km/h; 3.5 mph) submerged
Test depth: 100 m (330 ft)
Crew: 95
Notes: Fitted to carry 1 × Type A midget submarine

Design and description

The Type C submarines were derived from the earlier KD6 sub-class of the Kaidai class with a heavier torpedo armament for long-range attacks. They displaced 2,595 tonnes (2,554 long tons) surfaced and 3,618 tonnes (3,561 long tons) submerged. The submarines were 109.3 meters (358 ft 7 in) long, had a beam of 9.1 meters (29 ft 10 in) and a draft of 5.3 meters (17 ft 5 in). They had a diving depth of 100 meters (330 ft).[1]

For surface running, the boats were powered by two 6,200-brake-horsepower (4,623 kW) diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 1,000-horsepower (746 kW) electric motor. They could reach 23.6 knots (43.7 km/h; 27.2 mph) on the surface and 8 knots (15 km/h; 9.2 mph) underwater.[2] On the surface, the C1s had a range of 14,000 nautical miles (26,000 km; 16,000 mi) at 16 knots (30 km/h; 18 mph); submerged, they had a range of 60 nmi (110 km; 69 mi) at 3 knots (5.6 km/h; 3.5 mph).[3]

The boats were armed with eight internal bow 53.3 cm (21.0 in) torpedo tubes and carried a total of 20 torpedoes. They were also armed with a single 140 mm (5.5 in)/40 deck gun and two single or twin mounts for 25 mm (1 in) Type 96 anti-aircraft guns. They were equipped to carry one Type A midget submarine aft of the conning tower.[3]

Construction and career

I-24 was commissioned at Sasebo, Japan on 31 October 1941. She participated in the attack on Pearl Harbor as the mother ship of a midget submarine piloted by Ensign Kazuo Sakamaki, who became the first Japanese prisoner of war when his boat washed up on the shore of Oahu some time after the attack. I-24 also took part in the Battle of the Coral Sea and attack on Sydney Harbour in May and June 1942. I-24 was depth-charged, rammed, and sunk with all hands (104 officers and men) by the United States Navy subchaser USS Larchmont (PC-487) at 53°16′N 174°24′E near Shemya, Alaska on 11 June 1943.


  1. Bagnasco, p. 192
  2. Chesneau, p. 201
  3. Carpenter & Dorr, p. 104


  • Bagnasco, Erminio (1977). Submarines of World War Two. Annapolis, Maryland: Naval Institute Press. ISBN 0-87021-962-6.
  • Boyd, Carl & Yoshida, Akikiko (2002). The Japanese Submarine Force and World War II. Annapolis, Maryland: Naval Institute Press. ISBN 1-55750-015-0.
  • Carpenter, Dorr B. & Polmar, Norman (1986). Submarines of the Imperial Japanese Navy 1904–1945. London: Conway Maritime Press. ISBN 0-85177-396-6.
  • Chesneau, Roger, ed. (1980). Conway's All the World's Fighting Ships 1922–1946. Greenwich, UK: Conway Maritime Press. ISBN 0-85177-146-7.
  • Hackett, Bob; Kingsepp, Sander. "HIJMS Submarine I-24: Tabular Record of Movement". Sensuikan!. combinedfleet.com. Retrieved 10 May 2009.
  • Hashimoto, Mochitsura (1954). Sunk: The Story of the Japanese Submarine Fleet 1942 – 1945. Colegrave, E.H.M. (translator). London: Cassell and Company. ASIN B000QSM3L0.
  • Stille, Mark (2007). Imperial Japanese Navy Submarines 1941-45. New Vanguard. 135. Botley, Oxford, UK: Osprey Publishing. ISBN 978-1-84603-090-1.
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