Imperial Japanese Navy (IJN) Submarines
List of submarines, midget submarines and submersible cargo containers in World War II.
 J1 type submarine
I-1 sunk January 29, 1943 off Kamimbo Bay, Guadalcanal
I-3 sunk December 9, 1942 off Kamimbo Bay, Guadalcanal
I-4
J1 type modified submarine (I-5 class)
I-5 sub July 19, 1944 by USS Wyman (DE-38) east of Saipan
J2 type modified submarine (I-6 class)
I-6 sunk June 16, 1944 by accidental ramming by Toyokawa Maru northeast of Hachijo Shima
J3 type submarine (I-7 class)
I-7 scuttled July 5, 1943
I-8 sunk April 10, 1945 off Okinawa
Type A1 submarine
I-10 sunk July 4, 1944
I-11 sunk January 11, 1944
Type AM submarine
I-12 sunk November 13, 1944
I-14 sunk May 28, 1946 off Barber's Point on Oahu
Type B1 submarine
I-15 sunk November 10, 1942
Type C1 submarine
I-16 sunk May 19, 1944
I-17 sunk August 19, 1943
I-18 sunk February 11, 1943 *
I-19 sunk November 25, 1943 by depth charge attacks by USS Radford (DD-446)
Type C1 submarine
I-20 presumed lost November 18, 1943 off Espiritu Santo
I-21 probably sunk November 29, 1943 off Gilbert Islands **
I-22 missing December 12, 1942
Type B1 submarine
I-23 sunk February 28, 1942 off Hawaii
I-24 sunk June 11, 1943 off Shemya Island
I-25 likely sunk August 25, 1942
I-26 sunk October 25, 1944 / November 17, 1944 off Samar
I-27 sunk February 25, 1944 in the Indian Ocean
I-36 scuttled April 1, 1946 off Goto Island
I-37 sunk November 19, 1944
Type B2 submarine
I-43 sunk February 15, 1944 by USS Aspro SS-309 north of Truk
I-46 sunk November 1944 **
Type C2 submarine
I-47 scuttled April 1, 1945 off Goto Island
I-52 sunk June 24, 1944 roughly 1,200 miles west of the Cape Verde islands
I-55 (I-155) scuttled May 8, 1946
I-55 missing after July 13, 1944
I-58 scuttled April 1, 1945 off Goto Island
I-60 sunk January 17, 1942
I-70 sunk December 10, 1944 north of Hawaii
I-121-class submarine
I-121 scuttled April 30, 1946 wreckage found July 2018
I-122 sunk June 10, 1945
I-123
I-124
Kaidai type, KD6-class submarine
I-169 "Shinohara" (I-69) sunk April 4, 1944
Kaidai type, KD7-class submarine
I-176 sunk May 16, 1944
I-177 sunk October 3, 1944 *
I-178 sunk June 18, 1943 *
I-179 sunk July 14, 1943 accidentally off Akizaki
I-180 sunk April 16, 1944
I-181 sunk March 1, 1944
I-201-class submarine
I-201 sunk May 23, 1946 off Barber's Point on Oahu
I-400-class submarine Sentoku Type
I-400 sunk June 4, 1946 off Barber's Point on Oahu
I-401 sunk May 31, 1946 off Barber's Point on Oahu
I-402 scuttled April 1, 1945 off Goto Island
I-403 never completed, likely scrapped
I-404 scrapped postwar
Kriegsmarine Type IXC U-Boat
RO-500 (U-511) scuttled April 30, 1946 wreckage found 2018
Kriegsmarine Type IXD2 U-boat
I-501 (U-181) scuttled February 12, 1946
I-502 (U-862) scuttled February 13, 1946
Kaichū type submarine (K6 subclass)
RO-33 sunk August 29, 1942 at Kiska Harbor
RO-34 sunk
April 7, 1942 off San Cristobal by USS Strong
RO-35 sunk August 25, 1943 by
USS Patterson (DD-392)
RO-50 sunk April 1, 1946 off Kinai Island / Goto Island
RO 60 grounded December 29, 1941
RO-65 sunk September 28, 1942
RO-100-class submarine
RO-100 sunk November 24, 1943
RO-101 sunk September 15 , 1943
RO-102 sunk after May 9, 1943
RO-105 sunk May 31, 1944
RO-106 sunk May 22, 1944
RO-108 sunk May 26, 1944 by USS England (DE-635) Hedgehog attack
RO-107 missing after July 6, 1943
RO-109 sunk April 25, 1945 off Okinawa
RO-116 sunk May 24, 1944 by USS England (DE-635) Hedgehog attack
I-121-class submarine
I-123 (Submarine No. 50) sunk August 29, 1942
I-124 sunk January 21, 1942 off Darwin
Type A Midget Submarines
HA-8 Type A midget submarine scuttled December 3, 1942 off Guadalcanal
HA-10 Type A midget submarine missing November 28, 1942 off Guadalcanal
HA-11 Type A midget submarine scuttled November 7, 1942 off Cape Esperance, salvaged 1944
HA-14 Type A midget submarine (M27) scuttled May 31, 1942 Sydney Harbor salvaged displayed AWM
HA-16 Type A midget submarine (Midget E) sunk December 7, 1941 discovered 2009
HA-16 Type A midget submarine (M16b) missing May 30, 1942 off Diego-Suarez on Madagascar, one crew washed ashore
HA-18 Type A midget submarine (Midget D) sunk December 7, 1941 salvaged 1960 displayed Eta Jima
HA-19 Type A midget submarine (Midget C) grounded December 7, 1941 displayed National Museum of the Pacific War
HA-20 Type A midget submarine (Midget A) sunk December 7, 1941 by USS Ward discovered August 28, 2002 by HURL
HA-20b Type A midget submarine (M20b) beached May 30, 1942 on Madagascar crew killed in gunfight June 2, 1942
HA-21 Type A midget submarine (M22) sunk June 1, 1942 salvaged displayed AWM and RAN Heritage Centre
HA-22 Type A midget submarine scuttled off Cape Esperance on Guadalcanal
HA-22 Type A midget submarine (Midget B) sunk December 7, 1941 salvaged and buried at USN Submarine Base at
Pearl Harbor
HA-24 Type A midget submarine (M24) sunk June 1, 1942 Sydney Harbor discovered November 12, 2006
HA-30 Type A midget submarine scuttled November 11, 1942 off Guadalcanal
HA-37 Type A midget submarine scuttled November 19, 1942 off Guadalcanal
Type A midget submarine (Cape Esperance 1943) salvaged July 17, 1943 transported to United States
Type A midget submarine (Cape Esperance 1944) salvaged 1944 ultimate fate unknown
Type A midget submarine (Cape Esperance 1945) salvaged 1945 ultimate fate unknown
Type A midget submarine (Submarine Force Museum) salvaged from Guadalcanal displayed at Submarine Force Museum
Type A midget submarine (Kiska No. 1) abandoned July 23, 1943 at Kiska
Type A midget submarine (Kiska No. 2) abandoned July 23, 1943 at Kiska
Type A midget submarine (Kiska No. 3) abandoned July 23, 1943 at Kiska
Type A midget submarine (Composite) complete made from bow of M22 and center/stern of M27 at Australian War Memorial (AWM)
Type B Midget Submarines
HA-52 Type B midget submarine sunk February 16, 1944 off New Hanover
HA-53 Type B Midget Submarine discovered 2011 in Simpson Harbour
Kaiten
Kaiten No. 1 Lt(jg) Nishina Sekio sunk November 20, 1944 USS likely hit Mississinewa (AO-59)
Kaiten Type 1 (Ulithi Reef) sunk November 20, 1944
Kaiten Type 1 displayed at Yūshūkan (Yasukuni Museum)
Kaiten Type 1 displayed at the Keyport Naval Submarine Museum
Kaiten Type 2 displayed at History and Folklore Museum in Yamaguchi
Kaiten Type 4 displayed at Yūshūkan (Yasukuni Museum)
Kaiten Type 4 displayed at the New Jersey Naval Museum
Kaiten Type 4 displayed at USS Bowfin Submarine Museum
Kaiten Type 4 displayed at Royal Navy Submarine Museum
Kaiten Type 10 displayed at Kure Maritime Museum
Type D Koryu Midget Submarines
Type D Kairyu Midget submarine displayed at Yamato Museum
Unpoto / Oogata Unkato
Unpoto (Cannon Carrier, Cannon Sled) used to land cargo in New Guinea and the Solomons
Oogata Unkato No. 1 (Large Type Cargo Transporting Tube No. 1) abandoned near Kokopo, used as water carrier postwar
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