(KS type RO-109 scanned from "Submarines of the Imperial Japanese Navy"
by Polmar and Carpenter)
IJN Submarine RO-107:
Tabular Record of
© 2001-2016 Bob Hackett & Sander KingseppRevision 4
17 December 1941:
Kure. Laid down at Kure Navy Yard as a
525-ton Kaisho (KS) Type submarine No. 217.
8 April 1942:
Redesignated RO-107 and provisionally attached to
Sasebo Naval District.
30 May 1942:
Launched and designated RO-107
10 October 1942:
LtCdr (Cdr, posthumously) Kobayashi Shigeo (56)(the
current CO of I-171) is appointed Chief Equipping Officer of RO-106 and RO-107
as an additional duty.
10 December 1942:
Lt (Cdr, posthumously) Egi Shoichi (60)(former
CO of RO-65) is appointed Chief Equipping Officer.
26 December 1942:
Completed, commissioned and attached to Sasebo
Naval District. Lt Egi is the CO. Assigned to Kure SubRon.
15 March 1943:
Reassigned to Rear Admiral (later Vice Admiral) Harada
Kaku's (former CO of CVS CHIYODA) SubRon 7 in Vice Admiral Mikawa Gunichi's
(former CO of KIRISHIMA) Eighth Fleet/Southeast Area Fleet based at Rabaul.
31 March 1943:
Departs Sasebo for Rabaul.
12 April 1943:
Arrives at Rabaul.
22 April 1943:
Departs Rabaul to patrol E of Guadalcanal for her first
14 May 1943:
Returns to Rabaul.
27 May 1943:
Departs Rabaul to patrol E of Guadalcanal on her second
20 June 1943:
Returns to Rabaul.
30 June 1943: American Operation "TOENAILS" - The Invasion of New
Rear Admiral (later Admiral) Richmond K. Turner's Third Fleet
Amphibious Force, supported by land-based aircraft, lands Marines and Army
troops on Rendova and other islands in the New Georgia area, Solomons.
That day, Lt Egi departs Rabaul to patrol off Rendova Island, Solomons,
on RO-107's third war patrol.
6 July 1943:
RO-107's last message is received from the area E of
1 August 1943:
Presumed lost with all 42 hands in the Solomons.
1 September 1943:
Removed from the Navy List.
 RO-107 is usually listed as sunk by USS TAYLOR (DD-468)
on 12 July 1943. In reality, TAYLOR crippled RO-101 during that attack.
Orita Zenji, the former IJN submarine skipper and author of the book
"I-Boat Captain" has attributed the loss of RO-107 to USS RADFORD (DD-446) on 7
July 1943. Although the location is a good match, this is in all likelihood an
error, since RADFORD's attack took place on 1 July.
Thanks go to Dr. Higuchi Tatsuhiro of Japan. – Bob Hackett and Sander
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