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Type C I-16 Class
358' 7" x 29' 10" x 17' 6"
2,184 Tons (surfaced)
3,561 Tons (submerged)
6 × 21" Torpedo tubes with 20 Type 95 Torpedoes
1 × 140mm deck gun
2 x 25mm Type 96 AA guns
On December 7, 1941 at 2:57am I-20 launches HA-20 Type A Midget Submarine (Midget A) roughly 5.3 miles off the entrance to Pearl Harbor on Oahu. Afterwards, I-20 proceeds to the recovery area south of Lanai. None of the midget submarines arrive and all are presumed lost. On December 8, 1941 in the morning departs for Kwajalein arriving with I-16 on December 20, 1942.
On January 4, 1942 departs Kwajalein to conduct a war patrol in the Samoa-Fiji area. On January 11, 1942 surfaces and shells Pago Pago.
On January 16, 1942 off Suva fires two torpedoes at HMNZS Monowai but both explode prematurely. As I-20 surfaces, she is fired on by the vessel's 6" guns but her deck gun fires and claims a hit on the bridge before the sumarine crash dives when straddled by shells. Both are undamaged, HMNZS Monowai sends a submarine altert signal reporting the contact. On January 24, 1942 returns to Kwajalein then departs for Yokosuka arriving February 1, 1942.
Hashirajima, Hiroshima Bay. Vice Admiral Komatsu, Captain Ishizaki their staffs and midget submarine crews pay a courtesy call on the CINC, Combined Fleet, Admiral Yamamoto aboard his flagship Yamato. At 11:00, KO ("A") detachment departs for Penang.
On Aprul 27, 1942 I-20 arrives at Penang as part of "A detachment" including I-16, I-18 and I-20 with Nisshin transporting Type A midget submarines. At Penang, each mother submarines is loaded with a midget submarine, the second transported on I-20.
On April 30, 1942 departs Penang with "A detachment" bound for the Indian Ocean. On May 5-15, 1942 refueled at sea by Aikoku Maru and Hokoku Maru.
17 May 1942:
On May 20, 1942 I-10 catapults her Yokosuka E14Y1 "Glen" floatplane on a mission to reconnoiter Durban in South Africa.
24 May 1942:
On May 29, 1942 I-10 surfaces and her floatplane reconnoiters Diego Suarez on Madagascar. The plane sights the HMS Ramillies, an old 29,150-ton ROYAL SOVEREIGN-class battleship, at anchor in the bay. Also in the harbor are the destroyers HMS DUNCAN and ACTIVE, corvettes HMS GENISTA and THYME, troopship HMS KARANJA, hospital ship ATLANTIS, MV British Loyalty, merchant LLANDAFF CASTLE and an ammunition ship.
On May 30, 1942 I-20 launches HA-20b Type A Midget Submarine. Aboard is commander Lt Saburo Akieda with crew member PO1C Masami Takemoto. At 10:25pm, their midget submarine fires her first torpedo at HMS Ramillies that hits and damages it. Afterwards, the midget submarine was depth charged but fires her second torpedo at MV British Loyalty and sinks her in shallow water. Ten days later, HMS Ramillies departs for Durban on Union of South Africa.
Lt Akieda and PO1C Takemoto's craft is beached. Aided by natives, both sailors reach the shore and head for the recovery area. Afterwards, I-10's floatplane again reconnoiters Diego-Suarez Bay twice to assess the results. The missing Ramillies is erroneously considered as sunk by the Japanese.
1 June 1942:
2 June 1942:
3 June 1942:
5 June 1942: Commerce Raiding in the Indian Ocean:
8 June 1942:
11 June 1942:
12 June 1942:
19 June 1942:
29 June 1942:
30 June 1942:
5 July 1942:
21 July 1942:
5 August 1942:
14 August 1942:
On August 23, 1942 arrives at Yokosuka for repairs and overhaul. On September 15, 1942 assigned to commander LtCdr Yoshimura Iwao. On October 24, 1942 departs Yokosuka bound for Shortland.
On November 2, 1942 at Shortland I-20 joins I-16 and I-24 to form an attack group under the command of Captain Ota Nobunosuke that will transport a midget submarine from Chiyoda to operate off Guadalcanal. On November 5, 1942 embarks her third midget HA-11 Type A midget submarine and departs Shortland that evening bound for Guadalcanal.
On November 7, 1942 at 5:20am launches HA-11 Type A Midget Submarine four miles north of Cape Esperence off Guadalcanal. Aboard is commander Lt(jg) Nobuharu Kunihiro and and crew member PO1C Goro Inoue. Afterwards, I-20 returns to Truk.
On November 19, 1942 at 3:00am launches HA-37 Type A Midget Submarine roughly six miles off Cape Esperence on Guadalcanal. Aboard is commander Lt(jg) Miyoshi Yoshiaki with crew member PO1C Umeda Kiyoshi.
On December 18, 1942 assigned to Lt. Cdr Kudo Kaneo.
On January 1, 1943 assigned to SubDiv 1, SubRon 8 along with I-16, I-18, I-21 and I-24.
Damaged HMS Ramillies on 09-05-1942 by Kō-hyōteki.
Fates of the Crew
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