Patrol 1

13 Dec 1941- 5 Feb 1942

早隆丸 Soryu Maru (listed as Hayataka Maru in JANAC)

Patrol 2

19 Feb 1942- 9 Apr 1942

No sinkings

Patrol 3

12 May 1942 - 4 Jul 1942

Patrol 4

10 Aug 1942 - 2 Oct 1942

Patrol 5

24 Oct 1942 - 30 Nov 1942

Patrol 6

14 Apr 1943 - 3 Jun 1943

さんくれめんて丸 San Clemente Maru

Patrol 7

24 Jun 1943 - 24 Jul 1943

No sinkings

Seal badly damaged by bombs and depth charges off northern Honshu on 8 July 1943; patrol terminated

Patrol 8

16 Aug 1943 - 4 Oct 1943

No sinkings

Patrol 9

7 Nov 1943 - 19 Dec 1943

No sinkings

Patrol 10

17 Jan 1944 - 6 Mar 1944

No sinkings

Patrol 11

8 Aug 1944 - 8 Aug 1944

東征丸 Tosei Maru

Damaged the destroyer 波風 Namikaze; returned to service as a kaiten carrier and survived the war; later used as a repatriation ship. Alden incorrectly credits Seal with total loss of this vessel.

昭南丸 Shonan Maru

Patrol 12

10 Oct 1944 - 29 Nov 1944

7 ships, 27,765 tons, not including Namikaze, credited to Seal in Alden as a total loss but actually was returned to service. Namikaze was not credited to Seal in JANAC.

JANAC - 7 ships, 27,765 tons. Note that the criteria JANAC used included all Japanese Naval vessels (although JANAC did not usually count warships less than 500 tons that were converted from merchant ships) and all Japanese merchant vessels of 500 or more gross tons known or believed to have been lost during the war. Differences between JANAC figures and current research are noted above.

Alden-McDonald credit Seal with 8 ships and 28,980 tons sunk, including Namikaze as a total loss.

SORG credits Seal with 11 ships and 53,400 tons sunk.

Japanese Naval and Merchant Ship Losses - JANAC on the NHHC website

JANAC on the Hyperwar website - https://www.ibiblio.org/hyperwar/Japan/IJN/JANAC-Losses/JANAC-Losses-6.html

SORG- http://archive.hnsa.org/doc/subreports-sorg.htm (Excel spreadsheet download)

Archives of the Pacific Fleet Submarine Museum (PFSM)

War Patrol Reports - USS Seal

Monthly Losses of Combatant and Non-Combatant Vessels

太平洋戦争時の喪失船舶明細表（汽船主体）- Lost Vessel table during the Pacific War (merchant vessels)

Alden, John D., and McDonald, Craig R. - U.S. & Allied Sub Successes in the Pacific & Far East during WWII - Fourth Edition, 2009

Cressman, Robert - The Official Chronology of the U.S. Navy in World War II, Naval Institute Press, 2000.

Wrecksite - https://www.wrecksite.eu/wrecksite.aspx

Miramar Ship Index - https://www.miramarshipindex.nz/

Imperial Japanese Navy Page - http://www.combinedfleet.com/

Wikipedia Japan - https://ja.wikipedia.org/wiki/

Japan Center for Asian Historical Records - National Archives of Japan - https://www.jacar.go.jp/index.html

Official U.S. Navy Photos - Naval History & Heritage Command

Archives of the Pacific Fleet Submarine Museum (PFSM)

Japanese Merchant Ship photos - Wrecksite - copyright owners retain all rights. Photos used on this site will be taken down should the owner request their removal.

NavSource Online: Submarine Photo Archive