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	Ha-203 (center) with the submarines Ha-204 (left) and Ha-109 (right) at Kure, Japan, on 16 October 1945.
History
Japan
Name	Submarine No. 4913
Builder	Sasebo Naval Arsenal, Sasebo, Japan
Laid down	5 April 1945
Renamed	Ha-203 on 1 May 1945
Launched	25 May 1945
Completed	20 June 1945
Commissioned	20 June 1945
Fate	Surrendered 2 September 1945; Stricken 30 November 1945; Scuttled 1 April 1946;
General characteristics
Type	Submarine
Displacement	320 long tons (325 t) surfaced; 440 long tons (447 t) submerged;
Length	53.00 m (173 ft 11 in) overall
Beam	4.00 m (13 ft 1 in)
Draft	3.44 m (11 ft 3 in)
Propulsion	1 × intermediate diesel; 400 bhp surfaced; 1,250 shp submerged; single shaft;
Speed	11.8 knots (21.9 km/h) surfaced; 13.9 knots (25.7 km/h) submerged;
Range	3,000 nmi (5,600 km) at 10 knots (19 km/h) surfaced; 105 nmi (194 km) at 2 knots (3.7 km/h) submerged;
Test depth	100 m (330 ft)
Complement	26
Armament	2 × 533 mm (21 in) torpedo tubes; 4 × Type 95 torpedoes; 1 × 7.7 mm machine gun;

Ha-203 was an Imperial Japanese Navy Ha-201-class submarine. Completed and commissioned in May 1945, she served during the final months of World War II. She surrendered at the end of the war in September 1945 and was scuttled in April 1946.

Design and description

At the end of 1944, the Imperial Japanese Navy decided it needed large numbers of high-speed coastal submarines to defend the Japanese Home Islands^[1] against an anticipated Allied invasion (named Operation Downfall by the Allies). To meet this requirement, the Ha-201-class submarines were designed as small, fast submarines^[1] incorporating many of the same advanced ideas implemented in the German Type XXI and Type XXIII submarines. They were capable of submerged speeds of almost 14 knots (26 km/h; 16 mph).^[1]

The Ha-201 class displaced 325 metric tons (320 long tons) surfaced and 447 metric tons (440 long tons) submerged.^[1] The submarines were 53 meters (173 ft 11 in) long, had a beam of 4.00 meters (13 ft 1 in) and a draft of 3.44 meters (11 ft 3 in).^[1] For surface running, the submarines were powered by a single 400-brake-horsepower (298 kW) diesel engine that drove one propeller shaft.^[1] When submerged the propeller was driven by a 1,250-shaft-horsepower (932 kW) electric motor.^[1] They could reach 11.8 knots (21.9 km/h; 13.6 mph) on the surface and 13.9 knots (25.7 km/h; 16.0 mph) submerged.^[1] On the surface, the Ha-201-class submarines had a range of 3,000 nautical miles (5,600 km; 3,500 mi) at 10 knots (19 km/h; 12 mph); submerged, they had a range of 105 nmi (194 km; 121 mi) at 2 knots (3.7 km/h; 2.3 mph).^[1] Their armament consisted of two 533-millimeter (21 in) torpedo tubes with four torpedoes and a single mount for a 7.7-millimeter machine gun.^[1]

Construction and commissioning

Ha-203 was laid down on 5 April 1945 by the Sasebo Naval Arsenal at Sasebo, Japan, as Submarine No. 4913.^[2] She was renamed Ha-203 on 1 May 1945 and was attached provisionally to the Sasebo Naval District that day.^[2] Launched on 25 May 1945,^[2] she was completed and commissioned on 20 June 1945.^[2]

Service history

Upon commissioning, Ha-203 was attached formally to the Sasebo Naval District and assigned to Submarine Division 33 in the Kure Submarine Flotilla for workups.^[2] She had not yet conducted an operational patrol when hostilities between Japan and the Allies ended^[1] on 15 August 1945. She surrendered to the Allies at Sasebo on 2 September 1945.^[2] On 2 November 1945, she was reassigned to Japanese Submarine Division Three under United States Navy command along with her sister ships Ha-201, Ha-202, Ha-205, and Ha-210.^[2]

Disposal

The Japanese struck Ha-203 from the Navy list on 30 November 1945.^[2] She was among a number of Japanese submarines the U.S. Navy scuttled off the Goto Islands in Operation Road's End on 1 April 1946, sinking just beyond the 100-fathom (600 ft; 183 m) line at 32°37′N 129°17′E / 32.617°N 129.283°E / 32.617; 129.283 (Ha-203).^[2]

Notes

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k Hackett, Bob; Sander Kingsepp (2015). "Sen Taka Sho Type". Sensuikan!. Combinedfleet.com. Retrieved 9 October 2020.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Hackett, Bob; Kingsepp, Sander (2019). "IJN Submarine HA-203: Tabular Record of Movement". combinedfleet.com. Retrieved 9 October 2020.

References

Hackett, Bob; Kingsepp, Sander (2019). "IJN Submarine HA-203: Tabular Record of Movement". SENSUIKAN! Stories and Battle Histories of the IJN's Submarines. Combinedfleet.com. Retrieved 9 October 2020.
Hackett, Bob; Sander Kingsepp (2015). "Sen Taka Sho Type". Sensuikan!. Combinedfleet.com. Retrieved 9 October 2020.
"Rekishi Gunzō"., History of Pacific War Vol.17 I-Gō Submarines, Gakken (Japan), January 1998, ISBN 4-05-601767-0
Rekishi Gunzō, History of Pacific War Extra, "Perfect guide, The submarines of the Imperial Japanese Forces", Gakken (Japan), March 2005, ISBN 4-05-603890-2
The Maru Special, Japanese Naval Vessels No.43 Japanese Submarines III, Ushio Shobō (Japan), September 1980, Book code 68343-43
The Maru Special, Japanese Naval Vessels No.132 Japanese Submarines I "Revised edition", Ushio Shobō (Japan), February 1988, Book code 68344-36
Ships of the World special issue Vol.37, History of Japanese Submarines, "Kaijinsha"., (Japan), August 1993