SENSUIKAN!

Stories and Battle Histories of the IJN's Submarines

(Updated 12 March 2008)

By Bob Hackett and Sander Kingsepp

(I-8 by Takeshi Yuki scanned from "Color Paintings of Japanese Warships")

“For any author attempting to write about Japanese submarines and their operations during the Second World War one source above all others has consistently and reliably assisted this writer, making sure my dates, specifications, movements and skippers are all recorded correctly within the overall story. This is Bob Hackett and Sander Kingsepp's www.combinedfleet.com., a labour of love for the subject that is an invaluable reference source for researchers, filling in many of the gaps caused by the paucity of written material on Japanese submarines.”

-DR. MARK FELTON author of THE FUJITA PLAN: Japanese Attacks on the United States and Australia During the Second World War and YANAGI: The Secret Underwater Trade between Germany & Japan 1942-1945

“....of particular interest to those researching (Japanese) submarines is
www.combinedfleet.com/sensuikan.htm by Bob Hackett and Sander Kingsepp."

-ROBERT C. STERN author of THE HUNTER HUNTED: Submarine versus Submarine: Encounters from World War I to the Present


The Tabular Records of Movement (TROMs) for the IJN's submarines - "Sensuikan" - on these pages were prepared by Bob Hackett and Sander Kingsepp from Japanese and American source materials. They include the TROMs for Japan's largest class "A" submarines - the so-called I-Boats and the medium class "B" RO-Boats.

Every effort has been made to provide the latest verified information on their movements and fates. Nevertheless, the nature of submarine warfare sometimes precludes positive identification of the exact time and place of losses at sea. In such cases, we have indicated that the best information available - both Japanese and American - indicates a probable loss at the date and time given.

Feel free to post any questions to me or Sander on the Discussion & Questions board. - Bob Hackett.

Discussion & Questions

Shortcut to Special Features related to Japanese Submarines

AMERICAN PLANS EXPEDITION TO SALVAGE GOLD-LADEN JAPANESE WWII SUBMARINE by the Associated Press

OPERATION TAN NO. 2: The Japanese Attack on Task Force 58's Anchorage at Ulithi by Bob Hackett and Sander Kingsepp

YU-GO: The Japanese Plan for a Second Pearl Harbor Surprise Attack! by David Dickson, Bob Hackett and Sander Kingsepp

Japanese Submarines: Tabular Records of Movement (TROMs)

NOTE: Only dated TROMS are active links; unposted subs lead to `404' page.

Large I-Class Submarines
(Class types link to Jon Parshall and Forest Garner's specification summaries)

Kaidai Types Junsen & Type C Types with Aircraft Minelayers, Transports, High-Speed & Foreign
Type KD2

I-152 (revised 8/19/02) 		Type J1

I-1 (posted 1/18/02)
I-2 (revised 5/15/03)
I-3 (posted 2/18/02)
I-4 (posted 3/16/02)
Type A1

I-9 (posted 1/18/02)
I-10 (posted 2/1/02)
I-11 (posted 2/18/02)
 		Type KRS

I-121 (reposted 12/7/02)
I-122 (reposted 12/7/02)
I-123 (reposted 12/7/02)
I-124 (reposted 12/13/02)
Type KD3A/B

I-153 (posted 5/1/02)
I-154 (revised 11/25/07)
I-155((revised 3/8/08)
I-156(revised 7/7/02)
I-157(revised 8/19/02)
I-158(posted 7/19/02)
I-159(revised 7/31/02)
I-60 (revised 7/27/02)
 Type J1 Modified
I-5 (posted 5/1/02)
 Type A2
I-12 (revised 7/16/06)
 Type D1

I-361 (posted 3/16/02)
I-362 (posted 5/1/02)
I-363 (posted 5/25/02)
I-364(revised 6/17/02)
I-365(posted 7/1/02)
I-366(revised 2/5/05)
I-367(posted 7/19/02)
I-368(revised 8/19/02)
I-369(revised 2/5/05)
I-370(posted 8/10/02)
I-371(posted 8/10/02)
I-372(posted 8/10/02)
Type KD4

I-162(posted 7/1/02)
I-164(posted 7/19/02)
 Type J2

I-6(posted 5/25/02)
Type A Modified
I-13(revised 4/8/04)
I-14(revised 1/17/07)
 Type D2
I-373(posted 8/21/02)
Type KD5
I-165(revised 9/25/02)
I-166(posted 3/12/03)
 Type J3
I-7(posted 9/13/02)
I-8(revised 2/15/03)
 Type B1
I-15(posted 9/20/02)
I-17(revised 10/27/02)
I-19(posted 10/18/02)
I-21(revised 12/3/05)
I-23(revised 10/31/02)
I-25(revised 10/18/05)
I-26(posted 12/10/02)
I-27(posted 1/6/03)
I-28(posted 12/24/02)
I-29(revised 4/4/03)
I-30(posted 1/24/03)
I-31(posted 2/18/03)
I-32(revised 3/30/03)
I-33(posted 4/4/03)
I-34(revised 3/8/08)
I-35(posted 3/28/03)
I-36(posted 4/24/03)
I-37(posted 5/6/03)
I-38(posted 5/15/03)
I-39(posted 5/15/03)
Foreign Types

I-501(revised 8/17/03)
I-502(revised 8/17/03)
I-503(posted 3/12/03)
I-504(revised 8/17/03)
I-505(revised 8/17/03)
I-506(revised 8/17/03)
Type KD6

I-168(posted 6/10/03)
I-169(posted 7/5/03)
I-70(posted 7/5/03)
I-171(posted 7/11/03)
I-172(posted 7/11/03)
I-173(posted 7/11/03)
I-174(revised 7/24/03)
I-175(posted 7/25/03)
 Type C1

I-16(posted 8/26/03)
I-18(posted 9/12/03)
I-20(posted 9/12/03)
I-22(posted 10/4/03)
I-24(posted 10/16/03)
 Type B2

I-40(posted 10/16/03)
I-41(posted 10/27/03)
I-42(posted 11/7/03)
I-43(posted 11/7/03)
I-44(revised 7/14/07)
I-45(revised 11/29/05)
 Type SH

I-351(posted 11/22/03)
Type KD7

I-176(posted 12/12/03)
I-177(posted 1/12/04)
I-178(posted 1/12/04)
I-179(posted 1/21/04)
I-180(posted 1/21/04)
I-181(posted 2/4/04)
I-182(posted 2/6/04)
I-183(posted 2/4/04)
I-184(posted 2/13/04)
I-185(posted 2/13/04)
 Type C2

I-46(posted 11/22/03)
I-47(posted 2/20/04)
I-48(posted 2/20/04)
 Type B3/B4

I-54(posted 2/28/04)
I-56(posted 3/9/04)
I-58(posted 3/18/04)
 Sen Taka Type

I-201(posted 3/26/04)
I-202(posted 3/26/04)
I-203(posted 3/26/04)
Type C3/C4

I-52(revised 7/16/06)
I-53(posted 2/28/04)
I-55(posted 3/18/04)

 Sen Toku Type

I-400(revised 1/17/07)
I-401(revised 1/17/07)
I-402(posted 4/8/04)

Medium RO-Class Submarines
(Types link to Forest Garner's and Bob Hackett's specification summaries)
K5 Types K6 Types L4 Types KS Types Foreign Types
RO-33(posted 5/14/04)
RO-34(posted 5/14/04)
RO-35(posted 5/14/04)
RO-36(posted 5/14/04)
RO-37(posted 5/14/04)
RO-38 (posted 5/25/04)
RO-39 (posted 5/25/04)
RO-40 (posted 6/10/04)
RO-41 (revised 11/22/06)
RO-42 (posted 6/10/04)
RO-43 (posted 7/24/04)
RO-44 (posted 7/24/04)
RO-45 (posted 7/24/04)
RO-46 (revised 7/14/07)
RO-47 (posted 8/27/04)
RO-48 (posted 8/27/04)
RO-49 (posted 8/27/04)
RO-50 (posted 10/16/04)
RO-55 (posted 10/16/04)
RO-56 (posted 10/16/04)
 RO-60 (posted 10/16/04)
RO-61 (posted 11/12/04)
RO-62 (posted 11/12/04)
RO-63 (posted 11/12/04)
RO-64 (posted 11/12/04)
RO-65 (posted 12/27/04)
RO-66 (posted 12/27/04)
RO-67 (posted 12/27/04)
RO-68 (posted 12/27/04)
 RO-100 (posted 3/5/05)
RO-101 (posted 3/5/05)
RO-102 (posted 3/5/05)
RO-103 (posted 3/5/05)
RO-104(posted 4/17/05)
RO-105(posted 4/17/05)
RO-106(revised 12/7/07)
RO-107(posted 4/17/05)
RO-108 (posted 7/1/05)
RO-109 (posted 7/1/05)
RO-110 (posted 7/1/05)
RO-111 (posted 7/1/05)
RO-112 (posted 9/1/05)
RO-113 (posted 9/1/05)
RO-114(posted 9/1/05)
RO-115 (posted 9/1/05)
RO-116 (posted 10/27/05)
RO-117 (posted 10/27/05)
 RO-500(posted 1/14/06)
RO-501(posted 1/14/06)

Small HA-Class Submarines
(Types link to Bob Hackett's specification summaries)
Sen Yu Sho Type

HA-101(posted 1/14/06)
HA-102 (posted 3/10/06)
HA-103(posted 3/10/06)
HA-104 (posted 3/10/06)
HA-105 (posted 4/30/06)
HA-106 (posted 4/30/06)
HA-107(posted 4/30/06)
HA-108 (posted 4/30/06)
HA-109 (posted 7/13/06)
HA-110 (posted 7/13/06)
HA-111(posted 7/13/06)
HA-112 (posted 7/13/06)

Sen Taka Sho Type

HA-201 (posted 7/13/06)
HA-202 (posted 11/21/06)
HA-203 (posted 11/21/06)
HA-204 (posted 11/21/06)
HA-205 (posted 11/21/06)
HA-206 (posted 5/11/07)
HA-207 (posted 5/11/07)
HA-208 (posted 5/11/07)
HA-209(posted 5/11/07)
HA-210 (posted 5/11/07)
HA-216 (posted 5/11/07)

Midget Submarines
(Links to Stories and Battle Histories of the IJN's Midget Submarines)


Seaplane/Midget Submarine Carrier: Tabular Record of Movement (TROM)
(Class links to specification summary)

Chiyoda Class

Chiyoda(posted 5/25/06)


Submarine Depot Ships: Tabular Records of Movement (TROMs)
(Classes link to specifications summaries)

Jingei Class

Jingei (posted 2/26/05)
Chogei (posted 5/24/05)

Bibliography of Sources

About the Authors

Mr. Robert Hackett is a military historian and researcher. Retired from the United States Air Force and later from the aerospace industry, he resides in the United States.

Mr. Sander Kingsepp of Estonia is also a military historian and researcher. A talented linguist, Sander's translations of Japanese source materials have added immeasurably to these TROMs.

Bob and Sander prepared the TROMs on the IJN's submarines presented on the SENSUIKAN! pages and for the IJN's battleships and cruisers presented on the SENKAN! and JUNYOKAN! pages and are major contributors to the TROMs of various classes of auxiliaries and regular small combatant vessels detailed on TOKUSETSU KANSEN! and its related pages.