The was a small size-high underwater speed submarine of the Imperial Japanese Navy

Imperial Japanese Navy

The Imperial Japanese Navy was the navy of the Empire of Japan from 1869 until 1947, when it was dissolved following Japan's constitutional renunciation of the use of force as a means of settling international disputes...

 (IJN), serving during 1945. The official designation of the submarine was .

Construction

Project number S61. In the end of 1944, the IJN had to build many coastal defence submarines for the Japanese mainland decisive battle

Operation Downfall

Operation Downfall was the Allied plan for the invasion of Japan near the end of World War II. The operation was cancelled when Japan surrendered after the atomic bombing of Hiroshima and Nagasaki and the Soviet Union's declaration of war against Japan. The operation had two parts: Operation...

. 79 boats were planned under the Maru Sen Programme

Wartime Naval Armaments Supplement Programme (Japan, 1944)

The was the final armaments expansion plan of the Imperial Japanese Navy .-Background:Early 1944, the IJN started building warships for war. The plan did not include any large warships which were suitable for offensive operations.-Table of vessels:...

 (Boat #4911-4989). However only 9 boats were completed until the end of war.

Boats

Boat #	Name	Builder	Laid down	Launched	Completed	Fate
4911	Ha-201	Sasebo Naval Arsenal	01-03-1945	23-04-1945	31-05-1945	Decommissioned 30-11-1945. Scuttled off Gotō Islands Goto Islands The are Japanese islands in the East China Sea, off the western coast of Kyūshū. The islands are a part of Nagasaki Prefecture.- Geography :There are 140 islands in total, including five main islands:,,,, and....  01-04-1946.
4912	Ha-202	Sasebo Naval Arsenal	01-03-1945	23-04-1945	31-05-1945	Decommissioned 30-11-1945. Scuttled off Gotō Islands 01-04-1946.
4913	Ha-203	Sasebo Naval Arsenal	05-04-1945	25-05-1945	26-06-1945	Decommissioned 30-11-1945. Scuttled off Gotō Islands 01-04-1946.
4914	Ha-204	Sasebo Naval Arsenal	05-04-1945	01-06-1945	25-06-1945	Decommissioned 30-11-1945. Grounded at Aburatsu Bay, October 1946. Salvaged and scrapped August 1948.
4915	Ha-205	Sasebo Naval Arsenal	17-04-1945	14-05-1945	03-07-1945	Decommissioned 30-11-1945. Scuttled at Iyo Nada, May 1946.
4916	Ha-206	Kawasaki-Senshū Shipyard	19-03-1945	10-07-1945		Incomplete until the end of war (95%), sunk by typhoon 25-08-1945. Salvaged and scuttled at Kii Channel Kii Channel The is a strait separating the Japanese Home Islands of Honshū and Shikoku. This channel connects the Inland Sea with the Pacific Ocean....  06-05-1946.
4917	Ha-207	Sasebo Naval Arsenal	23-04-1945	26-05-1945	14-08-1945	Decommissioned 30-11-1945. Scuttled off Sasebo Sasebo, Nagasaki is a city located in Nagasaki Prefecture, Japan. As of 2011, the city has an estimated population of 259,800 and the density of 609 persons per km². The total area is 426.47 km². The locality is famed for its scenic beauty. The city includes a part of Saikai National Park...  05-04-1946.
4918	Ha-208	Sasebo Naval Arsenal	01-05-1945	26-05-1945	04-08-1945	Decommissioned 30-11-1945. Scuttled off Gotō Islands 01-04-1946.
4919	Ha-209	Sasebo Naval Arsenal	07-05-1945	31-05-1945	04-08-1945	Decommissioned 30-11-1945. Scrapped August 1946.
4920	Ha-210	Sasebo Naval Arsenal	14-05-1945	10-06-1945	11-08-1945	Decommissioned 30-11-1945. Scuttled off Sasebo 05-04-1946.
4921	Ha-211	Kawasaki-Senshū Shipyard	01-04-1945	April 1946		Incomplete until the end of war (40%). Scuttled at Kii Channel 06-05-1946.
4922	Ha-212	Kawasaki-Kōbe Shipyard	10-04-1945	25-06-1945		Incomplete until the end of war (95%). Scuttled at Kii Channel, May 1946.
4923	Ha-213	Mitsubishi-Kōbe Shipyard	15-05-1945	29-07-1945		Incomplete until the end of war (93%). Scuttled at Kii Channel 06-05-1946.
4924	Ha-214	Mitsubishi-Kōbe Shipyard	15-05-1945	15-08-1945		Incomplete until the end of war (75%). Scuttled at Kii Channel 06-05-1946.
4925	Ha-215	Sasebo Naval Arsenal	22-05-1945	15-05-1945		Incomplete until the end of war (95%). Scuttled off Sasebo 05-04-1946.
4926	Ha-216	Sasebo Naval Arsenal	27-05-1945	19-06-1945	16-08-1945	Decommissioned 30-11-1945. Scuttled off Sasebo 05-04-1946.
4927	Ha-217	Sasebo Naval Arsenal	02-06-1945	26-06-1945		Incomplete until the end of war (90%). Scuttled off Sasebo 05-04-1946.
4928	Ha-218	Sasebo Naval Arsenal	08-06-1945	02-07-1945		Incomplete until the end of war (90%). Scrapped, December 1946.
4929	Ha-219	Sasebo Naval Arsenal	15-06-1945	12-07-1945		Incomplete until the end of war (90%). Scuttled off Sasebo 05-04-1946.
4930	Ha-220	Kawasaki-Senshū Shipyard	10-05-1945			Incomplete until the end of war (20%). Scrapped, June 1946.
4931	Ha-221	Mitsubishi-Kōbe Shipyard	20-04-1945	04-08-1945		Incomplete until the end of war (85%). Scuttled at Kii Channel, 06-05-1946.
4932	Ha-222	Kawasaki-Senshū Shipyard	15-05-1945			Incomplete until the end of war (15%). Scrapped, June 1946.
4933	Ha-223	Kawasaki-Kōbe Shipyard	01-05-1945			Incomplete until the end of war (60%). Scrapped, June 1946.
4934	Ha-224	Mitsubishi-Kōbe Shipyard	07-06-1945			Incomplete until the end of war (55%). Scrapped, June 1946.
4935	Ha-225	Mitsubishi-Kōbe Shipyard	07-06-1945			Incomplete until the end of war (45%). Scrapped, June 1946.
4936	Ha-226	Mitsubishi-Kōbe Shipyard	16-06-1945			Incomplete until the end of war (35%). Scrapped, June 1946.
4937	Ha-227	Mitsubishi-Kōbe Shipyard	10-07-1945			Incomplete until the end of war (25%). Scrapped, June 1946.
4938	Ha-228	Sasebo Naval Arsenal	21-06-1945	18-07-1945		Incomplete until the end of war (75%). Scuttled off Sasebo 05-04-1946.
4939	Ha-229	Sasebo Naval Arsenal	27-06-1945	27-07-1945		Incomplete until the end of war (75%). Scrapped, December 1946.
4940	Ha-230	Sasebo Naval Arsenal	03-07-1945			Incomplete until the end of war (60%). Scrapped, December 1946.
4941	Ha-231	Sasebo Naval Arsenal	12-07-1945			Incomplete until the end of war (50%). Later scrapped.
4942	Ha-232	Sasebo Naval Arsenal	18-07-1945			Incomplete until the end of war (40%). Later scrapped.
4943	Ha-233	Kawasaki-Senshū Shipyard	01-06-1945			Incomplete until the end of war (10%). Later scrapped.
4944	Ha-234	Kawasaki-Kōbe Shipyard	15-05-1945			Incomplete until the end of war (50%). Scrapped, June 1946.
4945	Ha-235	Kawasaki-Senshū Shipyard	01-06-1945			Incomplete until the end of war (10%). Later scrapped.
4946	Ha-236	Kawasaki-Kōbe Shipyard	01-06-1945			Incomplete until the end of war (40%). Scrapped, June 1946.
4947	Ha-237	Mitsubishi-Kōbe Shipyard	10-07-1945			Incomplete until the end of war (25%). Scrapped, June 1946.
4948	Ha-238	Mitsubishi-Kōbe Shipyard	01-08-1945			Incomplete until the end of war (15%). Scrapped, June 1946.
4949	Ha-239	Mitsubishi-Kōbe Shipyard	01-08-1945			Incomplete until the end of war. Scrapped, June 1946.
4950	Ha-240	Mitsubishi-Kōbe Shipyard	01-08-1945			Incomplete until the end of war. Scrapped, June 1946.
4951 - 4955						Constructions were not started until the end of war.
4956	Ha-246	Kawasaki-Senshū Shipyard	13-07-1945			Incomplete until the end of war (5%). Later scrapped.
4957	Ha-247	Kawasaki-Kōbe Shipyard	26-06-1945			Incomplete until the end of war. Later scrapped.
4958 - 4989						Constructions were not started until the end of war.

See also

Comparable submarines

• German Type XXIII submarine
  German Type XXIII submarine
  German Type XXIII submarines were the first so-called elektroboats to become operational. They were small coastal submarines designed to operate in the shallow waters of the North Sea, Black Sea and Mediterranean Sea, where larger Type XXI Elektro boats were at risk in World War II. They were so...
  
  
• I-201 class submarine
• Vessel Number 71
  Submarine No.71
  Submarine No.71 was an experimental submarine of the Japanese Imperial Navy completed in 1938. The submarine was capable of a submerged speed of 21 knots, five years before the famous German type XXI U-boats achieved speeds of around 18 knots...
  
  
• Kairyu class submarine
  Kairyu class submarine
  The was a class of midget submarines of the Imperial Japanese Navy, designed in 1943–1944, and produced from the beginning of 1945. These submarines were meant to meet the invading American naval forces upon their anticipated approach of Tokyo.-History:...