TOKUSETSU SENSUI-BOKAN!


(Nachi Maru as a prewar OSK liner)

IJN Submarine Tender
NACHI MARU: Tabular Record of Movement

© 1998-2016 Bob Hackett, Sander Kingsepp and Peter Cundall

Revision 1


3 May 1926:
Kobe. Laid down at Mitsubishi Heavy Industries’ shipyard as a 1,605-ton passenger/cargo ship for the Osaka Shosen K.K. (OSK) Line.

9 October 1926:
Launched and named NACHI MARU.

20 December 1926:
Completed.

1 February 1927:
Departs Kobe for Katsuura.

3 February 1927:
Returns to Kobe and departs again for Katsuura on regular run.

12 December 1933:
Departs Kobe for Beppu on new run. Later, reverts to Kobe-Katsuura route.

10 July 1935:
Reverts again to Kobe to Beppu run. Later, again reverts to Kobe-Katsuura run.

1938:
NACHI MARU's name is re-rendered as NATI MARU. [1]

August 1938:
Reverts again to Kobe-Beppu run.

September 1938:
Transfers to Kochi-Sakaide-Tadotsu service.

February 1939:
Transfers to Imaari-Kochi service. Later that year, transfers to Kobe-Imabari service route.

4 May 1942:
Sold to Kansai Kisen, K.K., Osaka. Operates on Osaka-Komatsushima Line's express passenger/cargo service.

8 May 1942:
Departs Manila.

21 January 1943:
Requisitioned by the IJN and assigned to Kure Naval District.

21 March 1943:
Aioi. Completes conversion to an auxiliary gunboat at Harima Zosen's yard. Departs for Osaka and then to Yura, SW Honshu, on the Inland Sea.

23 March 1943:
Departs Yura on regular patrols of the Kii Suido area. [2]

26 March 1943:
Arrives at Yura.

28 March 1943:
Departs Yura.

30 March 1943:
Arrives at Yura.

1 April 1943:
Departs Yura.

4 April 1943:
Arrives at Yura.

6 April 1943:
Departs Yura.

10 April 1943:
Arrives at Yura.

13 April 1943:
Departs Yura.

14 April 1943:
Arrives at Yura.

20 April 1943:
Departs Yura.

24 April 1943:
Arrives at Yura.

28 April 1943:
Departs Yura.

1 May 1943:
Arrives at Yura.

7 May 1943:
Departs Yura.

10 May 1943:
Arrives at Yura.

12 May 1943:
Departs Yura.

13 May 1943:
Arrives at Yura.

15 May 1943:
Departs Yura.

18 May 1943:
Arrives at Yura.

23 May 1943:
Departs Yura.

28 May 1943:
Arrives at Yura.

2 June 1943:
Departs Yura.

8 June 1943:
Arrives at Yura.

10 June 1943:
Departs Yura.

13 June 1943:
Arrives at Yura.

19 June 1943:
Departs Yura.

22 June 1943:
Arrives at Yura.

30 June 1943:
Departs Yura.

8 July 1943:
Arrives at Yura.

11 July 1943:
Departs Yura.

14 July 1943:
Arrives at Yura.

18 July 1943:
Departs Yura.

24 July 1943:
Arrives at Yura.

26 July 1943:
Departs Yura.

28 July 1943:
Arrives at Yuranai (Outer Yura).

31 July 1943:
Departs Yuranai.

3 August 1943:
Arrives at Yuranai.

5 August 1943:
Departs Yuranai.

7 August 1943:
Arrives at Yuranai.

9 August 1943:
Departs Yuranai.

10 August 1943:
Arrives at Osaka, probably enters dock.

4 September 1943:
Departs Osaka and later that day arrives at Yuranai.

7 September 1943:
Departs Yuranai.

10 September 1943 :
Arrives at Yuranai.

13 September 1943:
Departs Yuranai.

18 September 1943:
Arrives at Yuranai.

20 September 1943:
Departs Yuranai.

24 September 1943:
Arrives at Yuranai.

26 September 1943:
Departs Yuranai.

29 September 1943:
Arrives at Yuranai.

1 October 1943:
Departs Yuranai.

4 October 1943:
Arrives at Yuranai.

8 October 1943:
Departs Yuranai.

11 October 1943:
Arrives at Yuranai.

16 October 1943:
Departs Yuranai.

20 October 1943:
Arrives at Yuranai.

22 October 1943:
Departs Yuranai.

24 October 1943:
Arrives at Yuranai.

29 October 1943:
Departs Yuranai.

1 November 1943:
Arrives at Yuranai.

6 November 1943:
Departs Yuranai.

9 November 1943:
Arrives at Yuranai.

11 November 1943:
Departs Yuranai.

12 November 1943:
Arrives at Yuranai.

16 November 1943:
Departs Yuranai.

19 November 1943:
Arrives at Yuranai.

22 November 1943:
Departs Yuranai.

25 November 1943:
Arrives at Yuranai.

29 November 1943:
Departs Yuranai.

2 December 1943:
Arrives at Yuranai.

6 December 1943:
Departs Yuranai.

9 December 1943:
Arrives at Yuranai.

12 December 1943:
Departs Yuranai.

14 December 1943:
Arrives at Yuranai.

16 December 1943:
Departs Yuranai.

18 December 1943:
Arrives at Yuranai.

20 December 1943:
Departs Yuranai.

21 December 1943:
Arrives at Yuranai.

23 December 1943:
Departs Yuranai.

1 January 1944:
Arrives at Yuranai.

4 January 1944:
Departs Yuranai.

5 January 1944:
Arrives at Yuranai.

8 January 1944:
Arrives at Osaka and enters drydock.

16 February 1944:
Departs Osaka.

17 February 1944:
Arrives at Yuranai.

20 February 1944:
Departs Yuranai.

26 February 1944:
Arrives at Yokosuka.

7 March 1944:
At 1300, NACHI MARU departs Chichi-Jima for Truk with minelayer YURIJIMA and auxiliary minesweeper TORISHIMA MARU escorting convoy Higashi-Matsu 1B consisting of IMIZU, HOKO and SHINFUKU MARUs.

14 March 1944:
Arrives at Truk.

24 March 1944:
At 0700, departs Saipan in convoy HIGASHI MATSU No. 2 (return) consisting of NACHI, TAKUNAN, AWA (ex-WAWA), DAITEN, MIHO, BINGO, RYUKA (YANAGAWA), TAKAOKA, HIBI, TAMAHOKO, TATSUHARU and SHINFUKU MARUs, fleet supply ship SOYA and an unidentified vessel escorted by destroyers NOWAKI, ASAKAZE, kaibokan MANJU and minelayer KYOSAI and subchasers CH-17, CH-31 and CH-32.

1 April 1944:
Arrives at Tokyo.

4 April 1944:
Departs Chichi Jima escorting convoy No. 4324 consisting of AWA and NISSHO MARUs, fleet supply ship SOYA and auxiliary minesweepers KEINAN MARU and TOSHI MARU No. 8, auxiliary netlayer KOGI MARU and auxiliary submarine chaser FUMI MARU.

E 6 April 1944:
At 31N KEINAN MARU is detached and returns to Chichi Jima. The convoy continues on to Yokosuka.

15 April 1944:
Departs Yokosuka.

16 April 1944:
Arrives at Yuranai.

20 April 1944:
Departs Yuranai and later that day arrives at Kushimoto.

22 April 1944:
Departs Kushimoto.

2 May 1944:
Arrives at Kushimoto.

5 May 1944:
Departs Kushimoto.

12 May 1944:
Arrives at Kushimoto.

16 May 1944:
Departs Kushimoto.

19 May 1944:
Arrives at Kushimoto.

22 May 1944:
Departs Kushimoto.

23 May 1944:
Arrives at Yuranai.

1 June 1944:
Departs Yuranai.

4 June 1944:
Arrives at Yuranai.

9 June 1944:
Departs Yuranai.

12 June 1944:
Arrives at Yuranai.

15 June 1944:
Departs Yuranai.

16 June 1944:
Arrives at Osaka.

19 June 1944:
Departs Osaka and later that day arrives at Yuranai.

22 June 1944:
Departs Yuranai.

29 June 1944:
Arrives at Tanabe.

2 July 1944:
Departs Tanabe.

4 July 1944:
Arrives at Yuranai.

8 July 1944:
Departs Yuranai.

10 July 1944:
Arrives at Tanabe.

14 July 1944:
Departs Tanabe.

15 July 1944:
Arrives at Osaka for drydocking.

22 August 1944:
Departs Osaka.

24 August 1944:
Arrives at Yuranai.

26 August 1944:
Departs Yuranai.

28 August 1944:
Arrives at Yuranai.

31 August 1944:
Departs Yuranai.

8 September 1944:
Arrives at Yuranai.

11 September 1944:
Departs Yuranai.

13 September 1944:
Arrives at Yuranai.

23 September 1944:
Departs Yuranai.

27 September 1944:
Arrives at Yuranai.

1 October 1944:
Departs Yuranai.

5 October 1944:
Arrives at Yuranai.

8 October 1944:
Departs Yuranai.

17 October 1944:
Arrives at Yuranai.

24 October 1944:
Departs Yuranai.

29 October 1944:
Arrives at Yuranai.

1 November 1944:
Departs Yuranai.

7 November 1944:
Arrives at Yuranai.

11 November 1944:
Departs Yuranai.

12 November 1944:
Arrives at Tanabe.

15 November 1944:
Departs Tanabe.

16 November 1944:
Arrives at Kobe, probably for repairs.

8 December 1944:
Departs Kobe.

14 December 1944:
Arrives at Yuranai.

19 December 1944:
Departs Yuranai.

25 December 1944:
Arrives at Yuranai.

29 December 1944:
Departs Yuranai.

2 January 1945:
Arrives at Yuranai.

8 January 1945:
Departs Yuranai.

14 January 1945:
Arrives at Yuranai.

January 1945:
Undergoes conversion to an auxiliary submarine depot ship.

20 January 1945:
Completes conversion. Assigned to Vice Admiral, the Marquis, Daigo Tadashige's (40) (former CO of KINU) Kure SubRon as a depot ship for midget submarines.

20 March 1945:
Kure. Rear Admiral Owada Noboru’s (44)(former CO of YAMASHIRO) Tenth Special Attack Force is formed at Kure and attached directly to HQ, Combined Fleet. The unit, consisting of 13 Koryu midget submarines, is tasked with developing new tactics for future Koryu and Kairyu midget submarine attacks.

25 May 1945:
Departs Otaka.

28 May 1945:
Arrives at Maizuru.

30 May 1945:
Departs Maizuru. Later that day, arrives at Anamizu.

6 June 1945:
Departs Anamizu.

9 June 1945:
Arrives at Ananmizu.

20 June 1945:
Departs Anamizu.

28 June 1945:
Arrives at Anamizu.

12 July 1945:
Departs Anamizu.

14 July 1945:
Arrives at Kogushi.

16 July 1945:
Departs Kogushi. N of Kyushu, off Mutsure Jima, NACHI MARU is damaged severely by a mine, probably laid by USAAF’s 20th AF’s Boeing B-29 “Super Fortress” heavy bombers, at 33-59N, 130-52E. Later that day, arrives at Yoshimi. [3]

September 1945:
Surrendered to the Allied Powers. Later allocated SCAPJAP No. N-063.

1945:
Undergoes repairs at an undetermined location for an unknown period of time.

1946:
Assigned to the Allied Repatriation Service. [4]

3 May 1947:
Removed from the Navy List.

August 1947:
Returned to owners and placed in Kansai Kisen’s service on their Osaka-Beppu route.

October 1951:
In service on Kansai Kisen’s Osaka-Kochi route.

March 1954:
In service on Kansai Kisen’s Osaka-Okinawa route.

April 1960:
Sold to Yasushi Sano Dock service.

1961:
Scrapped.


Authors' Note:
[1] Kanji remains unchanged.

[2] NACHI MARU maintained regular patrols for rest of 1943 with gaps for convoy work throughout 1944.

[3] In 1945, the U. S. Army Air Force launched a five-phased campaign known as “Operation Starvation” to mine Japan’s home waters. The USAAF used 80 to 100 B-29 “Super Fortress” heavy bombers of the 21st Bomber Command based at Tinian in the Marianas. B-29s could carry seven 2,000 lb. or twelve 1,000 lb. mines.

Beginning on 27 March 1945 and continuing until 5 August 1945, B-29s flew 1,529 nighttime radar sorties and laid 4,900 magnetic, 3,500 acoustic, 2,900 pressure and 700 low-frequency mines for a total of more than 12,000 mines laid in Japanese waters. These mines sank 294 ships, damaged 137 beyond repair and damaged another 239 that could be repaired. The total was 1, 250,000 tons sunk or damaged or about 75 percent of Japanese shipping available in March 1945. Only 15 B-29s were lost during the mining campaign.

Postwar, removal of these mines posed a major challenge for the Allied Occupation Forces. They pressed 269 Japanese ships of various types into mine sweeping service to augment their own efforts.

[4] No data were been found indicating NACHI MARU made any repatriation voyages. She probably was still under repair in 1946.

Thanks go to Gilbert Casse of France for general assistance and the photo of NACHI MARU.

- Bob Hackett, Sander Kingsepp and Peter Cundall.


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