IJN Submarine RO-40:
Tabular Record of
© 2001-2017 Bob Hackett & Sander Kingsepp
8 August 1942:
Laid down at Mitsubishi's Kobe Yard as a 960-ton type K6 Submarine No.
5 February 1943:
Renumbered RO-40 and provisionally attached to
Maizuru Naval District.
6 March 1943:
1 August 1943:
LtCdr (Cdr, posthumously) Kido Yasuo (60)(former CO
of RO-58) is appointed the Chief Equipping Officer (CEO).
28 September 1943:
Kobe. RO-40 is completed, comissioned and attached
to Maizuru Naval District. Assigned to SubRon 11 for working-up. LtCdr Kido
Yasuo is the Commanding Officer.
5 October 1943:
Inland Sea, 3 miles off Murozumi Lighthouse. During
a training cruise RO-40 collides with the sailing vessel OKAKI MARU. Both
ships receive minor damage.
20 November 1943: American Operation "GALVANIC" - The Invasion of the
Forces under Vice Admiral (later Admiral) Raymond A. Spruance
(USNA '06), Commander, Central Pacific, invade and capture Tarawa and Makin
2 December 1943:
Arrives at Tokuyama Fuel Depot. Refuels.
4 December 1943:
1 January 1944:
RO-40 is in Rear Admiral Owada Noboru’s
(44)(former CO of YAMASHIRO) SubRon 7 in SubDiv 11 with I-42, I-43, I-52, I-183,
I-184 and RO-41, RO-43, RO-113 and RO-114.
15 January 1944:
Reassigned to SubDiv 34, Sixth Fleet.
20 January 1944:
29 January 1944:
Arrives at Truk.
31 January 1944: American Operation "FLINTLOCK" - The Invasion of the
Vice Admiral (later Admiral) Marc A. Mitscher's (USNA
’10) Task Force 58 lands the 4th Marine Division and the Army's 7th Infantry
Division that capture Kwajalein, Roi-Namur and Majuro.
12 February 1944:
RO-40 departs Truk for the Makin area. No
messages are received from her thereafter.
12 February 1944:
Departs Truk for an area E of Gilberts via
Marshalls on her first war patrol.
16 February 1944:
45 miles NW of Kwajalein, Marshall Islands. A
submarine makes an approach on a American convoy. At 1742, LtCdr D. L.
Martineau's USS PHELPS (DD-360) makes sonar contact at 1,700 yards. PHELPS drops
a pattern of 13 depth charges on the contact. Cdr J. W. Ramey's MACDONOUGH
(DD-351) and Lt F. K. Zinn's minesweeper SAGE (AM-111) then join the hunt and
lay patterns of depth charges that sink a submarine - probably RO-40 - at
20 February 1944:
The CINC, Sixth Fleet, Vice Admiral (Admiral,
posthumously) Takagi Takeo (39)(former CO of MUTSU) redirects RO-40 into an area
between Kwajalein and Brown Island to raid enemy supply routes between Hawaii,
Tarawa and Makin.
4 March 1944:
RO-40 fails to acknowledge the order to return.
28 March 1944:
Presumed lost with all 69 hands in the Gilberts
30 April 1944:
Removed from the Navy List.
Thanks go to Dr. Higuchi Tatsuhiro of Japan.
– Bob Hackett and Sander Kingsepp
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