SENSUIKAN!

(RO-66)

IJN Submarine RO-63:
Tabular Record of Movement

2001-2017 Bob Hackett & Sander Kingsepp:
Revision 4


2 April 1923:
Kobe. Laid down at Mitsubishi Shipbuilding as Submarine No. 48, a 990-ton L4 submarine.

24 January 1924:
Launched.

20 October 1924:
LtCdr (later Vice Admiral) Hiraoka Kumeichi (39)(former CO of RO-60) is appointed the Chief Equipping Officer.

1 November 1924:
Renumbered RO-63.

20 December 1924:
Mitsubishi Kobe Yard. RO-63 is completed and registered in the IJN. Attached to Maizuru Naval District. Assigned to SubDiv 33. LtCdr Hiraoka Kumeichi is the Commanding Officer.

1 December 1925:
LtCdr (later Captain) Kosokabe Yuzuru (38)(former CO of RO-54) is appointed the CO.

4 August 1926:
LtCdr (later Captain) Sekino Akira (38)(former CO of RO-55) is appointed the CO.

15 January 1928:
LtCdr (Rear Admiral, posthumously) Ito Jotaro (42)(former CO of RO-21) is appointed the CO.

10 March 1929:
Placed in reserve at Maizuru.

29 June 1929:
Lt (Rear Admiral, posthumously) Nakaoka Nobuki (45) (former CO of RO-26) is appointed the CO.

13 November 1929:
Off Sasebo. After conducting diving exercises in company of RO-64, RO-63, returning to Sasebo, collides with the small motor vessel SEGAWA MARU and receives minor damage to her starboard bow.

30 November 1929:
LtCdr (Rear Admiral, posthumously) Otake Toshio (45) (former CO of RO-65) is appointed the CO.

1 December 1931:
Lt (promoted LtCdr 1 Dec 1932; Rear Admiral, posthumously) Shimizu Taro (48)(former torpedo officer of I-58) is appointed the CO.

1 December 1932:
Placed in reserve at Maizuru. LtCdr Shimizu is appointed the CO of RO-64 as an additional duty.

20 March 1934:
LtCdr (Rear Admiral, posthumously) Yamada Takashi (49) (former CO of RO-32) is appointed the CO.

28 February 1935:
Placed in reserve at Maizuru. LtCdr (later Captain) Otani Kiyonori (49)(former CO of I-124) is appointed the CO.

15 February 1936:
Lt (promoted LtCdr 1 December 1936; later Captain) Yamada Kaoru (50) is appointed the CO.

20 March 1937:
Lt (later Captain) Inaba Michimune (51)(former torpedo officer of I-56) is appointed the CO.

1 July 1937:
Lt Inaba is appointed the CO of RO-68 as an additional duty.

31 July 1937:
LtCdr (later Captain) Yokota Minoru (51)(former CO of I-22) is appointed the CO.

15 November 1937:
LtCdr (Captain, posthumously) Hanabusa Hakushi (51)(former CO of RO-64) is appointed the CO.

19 March 1938:
LtCdr Inaba Michimune (51)(former torpedo officer of I-60) is appointed the CO (his second tour as the CO of that boat).

15 December 1938:
LtCdr (Cdr, posthumously) Yajima Yasuo (51)(former CO of RO-65/RO-67) is appointed the CO.

1 September 1939:
Reassigned to SubDiv 33. LtCdr (later Captain) Tagami Meiji (51)(former CO of RO-59) is appointed the CO.

20 November 1939:
LtCdr (Captain, posthumously) Ohira Masajiro (52) (former torpedo officer of I-70) is appointed the CO.

20 March 1940:
Lt (Cdr, posthumously) Izutsu Monshiro (57)(former torpedo officer of I-59) is appointed the CO.

15 October 1940:
LtCdr (later Cdr) Kusaka Toshio (53)(former CO of RO-58) is appointed the CO.

2 December 1941:
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). Mt. Niitaka, located in Formosa (now Taiwan), is then the highest point in the Japanese Empire.

8 December 1941:
RO-63 is in Rear Admiral Onishi Shinzo's (42) SubRon 7 with Captain Nagai Takeo's (47) SubDiv 33 in Vice Admiral (later Admiral) Inoue Shigeyoshi's (37)(former CO of HIEI) Fourth Fleet with RO-64 and RO-68. LtCdr Kusaka Toshio is the CO.

Departs Kwajalein for Howland Island.

12 December 1941:
Arrives within 85 miles NW of Howland. LtCdr Kusaka sights an enemy aircraft.

14 to 15 December 1941:
Reconnoiters Howland.

19 December 1941:
Returns to Kwajalein.

7 January 1942:
Departs Kwajalein for Truk.

11 January 1942:
Arrives at Truk.

15 January 1942:
Departs Truk with RO-64 and RO-68 to reconnoiter Rabaul, New Britain. Patrols S of Cape St. George.

29 January 1942:
Returns to Truk.

10 February 1942:
LtCdr (Cdr, posthumously) Nagai Katsuhiko (57)(former CO of RO-57) is appointed the CO.

18 February 1942:
Departs Truk for the Marshalls area in company of RO-64 and RO-68.

23 February 1942:
Arrives at Ponape.

24 February 1942:
Departs Ponape in company of RO-64 and RO-68 for the Marshalls area.

27 February 1942:
Soon after departure her horizontal rudder is rendered inoperable. RO-63 heads for Bikini for repairs.

1 March 1942:
Departs after makeshift repairs but the jury-rigged rudder breaks up again. Returns to Bikini.

2 March 1942:
Departs Bikini for Ponape.

5 March 1942:
Arrives at Ponape.

7 March 1942:
Departs Ponape for Truk.

9 March 1942:
Arrives at Truk.

19 March 1942:
Departs Truk for Saipan.

22 March 1942:
Arrives at Saipan.

26 March 1942:
Departs Saipan for Maizuru.

3 April 1942:
Arrives at Maizuru. Undergoes repairs.

5 June 1942:
Departs Maizuru for Saipan.

13 June 1942:
Arrives at Saipan, departs for Truk thereafter.

27 June 1942:
Departs Truk for Yokosuka.

4 July 1942:
Arrives at Yokosuka.

14 July 1942:
SubDiv 33 is transferred to the Fifth Fleet.

24 July 1942:
At 1600, departs Yokosuka for Paramushiro in company of RO-64 and RO-68.

29 July 1942:
Arrives at Paramushiro.

31 July 1942:
Departs Paramushiro for Kiska with RO-68.

4 August 1942:
Arrives at Kiska. RO-63 is in Cdr (Rear Admiral, posthumously) Kato Ryonosuke's (48) SubDiv 33 with I-6, RO-61, RO-62, RO-64, RO-65, RO-67 and RO-68.

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

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

17-20 August 1942:
Patrols off Aleutians, then returns to Kiska.

28-30 August 1942:
Patrols off Aleutians, then returns to Kiska.

3-5 September 1942:
Patrols off Aleutians, then returns to Kiska.

6-11 September 1942:
Patrols off Aleutians, then returns to Kiska.

14 September 1942:
Kiska. During an air raid on Kiska, RO-63 manages to dive before the arrival of the planes, but a bomb dropped from a B-24 damages her No. 1 periscope underwater.

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

22-24 September 1942:
Patrols off Aleutians, then returns to Kiska.

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

26 September 1942:
Departs Kiska for Maizuru in company of RO-64 and RO-68.

5 October 1942:
Arrives at Maizuru.

15 October 1942:
Lt (later LtCdr) Nanbu Nobukiyo (61)(former torpedo officer of I-17) is appointed the CO.

6 November 1942:
Departs Maizuru for Kure.

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

1 January 1943:
Kure Naval District. RO-63 is in SubDiv 33 with RO-64 and RO-68. Training duties.

16 March 1943:
Lt (Cdr, posthumously) Kondo Fumitake (62)(former torpedo officer of I-122) is appointed the CO.

25 July 1943:
LtCdr (Cdr, posthumously) Nishiuchi Shoichi (60) (former CO of RO-105) is appointed the CO.

20 December 1943:
Lt (LtCdr, posthumously) Suzuki Katsuhito (63)(former torpedo officer of I-26) is appointed the CO.

23 February 1944:
Captain Otani Kiyonori (49), the current ComSubDiv 33, is appointed the CO RO-63 as an additional duty (his second tour as the CO of that boat).

30 April 1944:
Lt (Cdr, posthumously) Chikuma Chuzo (65)(former torpedo officer of RO-106) is appointed the CO. [1]

5 August 1944:
Lt (later LtCdr) Koreeda Sadayoshi (64)(former CO of RO-115) is appointed the CO.

20 August 1944:
Lt (later LtCdr) Nakajima Mari (66)(former torpedo officer of I-122) is appointed the CO.

14 October 1944:
Lt Arai Kanichi (69)(former torpedo officer of HARUSAME) is appointed the CO.

6 November 1944:
Lt Imanishi Saburo (67)(former torpedo officer of I-36) is appointed the CO.

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

28 March 1945:
RO-63 is slated to become the tender of the newly-established Koryu type midget submarine detachment on Amami-Oshima Island (Amami Archipelago). She undergoes a makeshift conversion at Kure Navy Yard, during which a 25-mm Type 96 AA gun and an E27 Type 3 radar detector are installed.

8 April 1945:
Departs Kure for Sasebo.

10 April 1945:
At 1355 departs Sasebo for Amami-Oshima, carrying torpedoes and spares.

13 April 1945:
Arrives at Koniya, Amami-Oshima and unloads her cargo that night. During the next two weeks continual air attacks force RO-63 to spend the days submerged on the bottom and surface at night.

29 April 1945:
Receives the order to return to Sasebo.

30 April 1945:
Embarks a cargo of sugar at Kasari Bay, then departs for Sasebo.

3 May 1945:
Returns to Sasebo. Drydocked until mid-May.

Mid-May 1945:
Returns to Otake, resumes training duties.

1-12 June 1945:
Lt Imanishi is appointed the CO of RO-62 as an additional duty.

14 June 1945:
Lt Imanishi is appointed the CO of I-367. No new CO is appointed.

20 July 1945:
LtCdr Morita Ryoji (64)(former CO of RO-67) is appointed the CO.

30 July 1945:
LtCdr Taketomi Kunio (65)(former CO of I-367) is appointed the CO.

15 August 1945:
Maizuru. Surrendered to the Allies.

20 November 1945:
Removed from the Navy List.

May 1946:
Scuttled in the Iyo Nada.


Authors' Note:
[1] Chikuma Chuzo's name appears in some Japanese references as Takema Chuzo.

Thanks go to Dr. Higuchi Tatsuhiro of Japan.

Bob Hackett and Sander Kingsepp.


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