IJN Submarine RO-64:
Tabular Record of Movement

© 2001-2017 Bob Hackett & Sander Kingsepp:
Revision 2

15 October 1923:
Kobe. Laid down Mitsubishi Shipbuilding as a 990-ton L4 submarine.

19 August 1924:
Launched and designated RO-64.

15 January 1925:
LtCdr (later Vice Admiral), Marquis Daigo Tadashige (40)(former division officer of ASAMA) is appointed the Chief Equipping Officer (CEO).

30 April 1925:
Completed and commissioned in the IJN. LtCdr Daigo Tadashige is the Commanding Officer.

1 December 1925:
Lt (later Rear Admiral) Kouda Takero (41)(former CO of RO-23) is appointed the CO.

1 December 1927:
LtCdr (later Rear Admiral) Matsuzaki Akira (43)(former navigating officer of RO-60) is appointed the CO.

10 December 1928:
Placed in reserve. Lt (later Captain) Mizohata Sadaichi (46)(current CO of RO-68) is appointed the CO of RO-64 as an additional duty.

10 March-29 June 1929:
Lt Mizohata is appointed the CO of RO-63 as an additional duty.

1 November 1929:
Lt (promoted LtCdr 30 November; Rear Admiral, posthumously) Tamaki Tomejiro (45)(former CO of RO-28) is appointed the CO.

1 December 1930:
LtCdr (later Rear Admiral) Sasaki Hankyu (45)(former CO of RO-62) is appointed the CO.

1 December 1931:
Lt (later Cdr) Nagai Chodayu (48)(former torpedo officer of I-4) is appointed the CO. [1]

1 December 1932:
LtCdr (Rear Admiral, posthumously) Shimizu Taro (48)(current CO of RO-63) is appointed the CO of RO-64 as an additional duty.

25 March 1933:
Lt (promoted LtCdr 15 November 1933; later Captain) Hatanaka Sumihiko (49)(former torpedo officer of I-3) is appointed the CO.

28 February 1935:
Lt (promoted LtCdr 15 November; later Captain) Nakagawa Hajime (50)(former CO of RO-30) is appointed the CO.

15 February 1936:
LtCdr (Captain, posthumously) Izu Juichi (51)(former CO of RO-62) is appointed the CO.

20 March 1937:
LtCdr (Captain, posthumously) Hanabusa Hakushi (51)(former torpedo officer of I-2) is appointed the CO.

15 November 1937:
LtCdr (later Captain) Ikezawa Masayuki (52)(former torpedo officer of I-54) is appointed the CO.

19 March-1 September 1938:
LtCdr (later Captain) Yoshitome Zennosuke (52)(former torpedo officer of I-73) is appointed the CO.

1 April 1939:
LtCdr (Captain, posthumously) Ogawa Tsunayoshi (50) (former CO of RO-67) is appointed the CO.

11 September 1939:
LtCdr (Rear Admiral, posthumously) Togami Ichiro (51)(current CO of I-65) is appointed the CO of RO-64 as an additional duty.

1 November 1939:
Lt (promoted LtCdr 15 November) Ota Takeshi (55)(former CO of KURI) is appointed the CO.

20 March 1940:
Placed in reserve.

26 July 1940:
LtCdr (Captain, posthumously) Uno Kameo (53)(former CO of RO-65) is appointed the CO.

2 December 1941: Operation "Z":
The coded signal "Niitakayama nobore (Climb Mt. Niitaka) 1208" is received from the Combined Fleet. It signifies that hostilities will commence on 8 December (Japan time). [2]

4 December 1941:
Kwajalein, Marshall Islands. RO-64 is in Captain Nagai Takeo's (47)SubDiv 33, in Rear Admiral Onishi Shinzo's (42) SubRon 7 in Vice Admiral (later Admiral) Inoue Shigeyoshi's (37)(former CO of HIEI) Fourth Fleet with RO-63 and RO-68. LtCdr Uno Kameo is the Commanding Officer.

Departs Kwajalein with RO-68 to reconnoiter the Phoenix islands and to destroy the "seaplane base” located on Howland.

5 December 1941:
Reconnoiters Majuro.

7 December 1941:
Arrives off Phoenix islands.

10 December 1941:
Arrives off Howland and commences a periscopic reconnaissance. Considering the sea state and that his boat may have been spotted, LtCdr Uno decides against sending a landing party to destroy the shore facilities.

11 December 1941:
At 0200 (JST), RO-64 closes to within 2,200 yards, then opens fire with her deck gun, She targets the wireless and weather station, runways, depots, barracks and the lighthouse. As a result of her one-hour shelling, a number of buildings are set ablaze and there are several casualties among the locals. Between 1500 and 1520 (JST), RO-64 shells Baker Island that is also bombarded by RO-68.

15 December 1941:
Returns to Kwajalein with RO-68.

24 December 1941:
Departs Kwajalein for Wake.

27 December 1941:
Arrives off Wake.

28 to 30 December 1941:
Patrols E of Wake, then arrives at Wake.

1 January 1942:
Departs Wake for Truk.

6 January 1942:
Arrives at Truk.

15 January 1942:
Departs Truk with RO-63 and RO-68 to reconnoiter Rabaul, New Britain. Patrols S of Cape St. George.

29 January 1942:
Returns to Truk.

10 February 1942:
Lt (Cdr, posthumously) Tabata Sunao (58)(former CO of RO-58) is appointed the CO.

18 February 1942:
Departs Truk for the Marshalls area in company of RO-63 and RO-68.

23 February 1942:
Arrives at Ponape.

24 February 1942:
Departs Ponape with RO-63 and RO-68 for the Marshalls area.

27 February 1942:
Following an accident with RO-63, heads for Bikini.

28 February 1942:
Arrives at Bikini; departs the next day.

12 March 1942:
Arrives at Kwajalein.

16 March 1942:
Departs Kwajalein for Ponape.

19 March 1942:
Arrives at Ponape.

20 March 1942:
Departs Ponape for Truk.

21 March 1942:
Arrives at Truk.

27 March 1942:
Departs Truk for Saipan.

29 March 1942:
Arrives at Saipan.

30 March 1942:
Departs Saipan for Maizuru.

7 April 1942:
Arrives at Maizuru, later transferred to Yokosuka.

14 July 1942:
Cdr (Rear Admiral, posthumously) Kato Ryonosuke's (48) SubDiv 33 is transferred to the Fifth Fleet.

24 July 1942:
Departs Yokosuka for Paramushiro with RO-63 and RO-68, but has to abort her sortie because of an outbreak of food poisoning.

26 July 1942:
Returns to Yokosuka; departs the next day for Paramushiro.

1 August 1942:
Arrives at Paramushiro.

2 August 1942:
Departs Paramushiro for Kiska.

6 August 1942:
Arrives at Kiska.

7 August 1942:
Rear Admiral (later Vice Admiral) William W. Smith's (USNA '09)(former Chief of Staff to Admiral Husband E. Kimmel's (USNA '04), TG 8.6 shells Kiska. RO-61, RO-64, RO-68 and I-6 anchored in the harbor crash-dive to escape damage.

8 to 10 August 1942:
RO-64, RO-61, RO-63 and RO-68 sortie to intercept TG 8.6, but fail to make contact.

11 to 13 August 1942:
Conducts a search for the crew of a ditched reconnaissance plane.

17 to 26 August 1942:
Patrols off Aleutians, then returns to Kiska.

29 August 1942:
A Kiska-based E13A1 "Jake" reconnaissance plane reports a "heavy cruiser" at anchor in Nazan Bay at Atka Island, Aleutians. The RO-64 departs Kiska for Nazan Bay with RO-61.

4 September 1942:
Returns to Kiska.

5 to 17 September 1942:
Patrols off Aleutians.

15 September 1942:
SubDiv 22 and SubDiv 33 are temporarily attached to Rear Admiral Akiyama Katsuzo's (40) 51st Base Unit (HQ Kiska).

25 September 1942:
SubDiv 33 is reassigned to the Kure SubRon.

26 September 1942:
Departs Kiska for Maizuru with RO-63 and RO-68.

5 October 1942:
Arrives at Maizuru; departs the next day for Kure.

15 October 1942:
Lt (Cdr, posthumously) Wada Mutsuo (61)(former torpedo officer of I-65) is appointed the CO.

8 November 1942:
Arrives at Kure. Used as training ship thereafter.

25 May 1943:
Captain (Rear Admiral, posthumously) Kato Ryonosuke (48)(current ComSubDiv 33) is appointed the CO of RO-64 as an additional duty.

1 September 1943:
Captain (Rear Admiral, posthumously) Narahara Seigo (48), the new ComSubDiv 33, is appointed the CO of RO-64 as an additional duty.

1 January 1944:
Kure Naval District. RO-64 is in SubDiv 33 with RO-62, RO-63, RO-67 and RO-68. Training duties.

20 January 1944
Lt (Cdr, posthumously) Okayama Noboru (64)(former torpedo officer of I-29) is appointed the CO.

30 April 1944
Lt (Cdr, posthumously) Ono Yasushi (65)(former torpedo officer of I-10) is appointed the CO.

31 August 1944
Lt (later LtCdr) Sato Kiyoteru (66)(former torpedo officer of I-53) is appointed the CO.

14 October 1944
Lt Kiuchi Tetsuro (69)(former torpedo officer of HATSUZUKI) is appointed the CO.

6 November 1944:
Lt Tokunaga Masahiko (67)(former torpedo officer of I-177) is appointed the CO.

11 November 1944:
Lt Yoshizawa Chiaki (69)(former torpedo officer of I-47) is appointed the CO.

1 January 1945:
Kure Naval District. RO-64 is in SubDiv 33 with RO-63 and RO-67. Training duties.

15 February 1945:
ComSubDiv 33, Captain Otani Kiyonori (former CO of I-18), is appointed the CO of RO-64 as an additional duty.

15 March 1945:
Captain (Rear Admiral, posthumously) Ankyu Eitaro (40)(former CO of I-38) is appointed the new ComSubDiv 33 and the CO of RO-64 as an additional duty.

12 April 1945:
Hiroshima Bay. RO-64 is proceeding underwater on a training mission. At 1428, she hits a mine laid by an American aircraft and sinks quickly with her crew of 50 plus ComSubDiv 33's Capt Ankyu and 30 students.

10 August 1945:
Removed from the Navy List.

Authors' Notes:
[1] Nagai Chodayu later changed his name to Nagai Komei.

[2] Mt. Niitaka, located in Formosa (now Taiwan), was then the highest point in the Japanese Empire.

Thanks go to Dr. Higuchi Tatsuhiro of Japan.

– Bob Hackett and Sander Kingsepp.

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