IJN Submarine RO-35:
Tabular Record of
© 2001-2017 Bob Hackett & Sander Kingsepp
9 October 1941:
Laid down at Mitsubishi Kobe Yard as the
lead boat of the 965-ton K6 class, Submarine
4 June 1942:
Launched as RO-35 and provisionally attached to Maizuru
20 November 1942:
Lt (Cdr, posthumously) Manabe Masateru
(60) (former CEO of RO-104 and RO-105) is appointed the Chief Equipping
25 March 1943:
Kobe. RO-35 is completed, commissioned in the IJN
and attached to Maizuru Naval District. Lt (promoted LtCdr 1 June 1943) Manabe
Masateru is the Commanding Officer.
1 April 1943:
RO-35 is assigned to SubRon 11 for working-up.
17 July 1943:
Departs Kure for Truk.
20 July 1943:
Reassigned to 1st Submarine Unit, Sixth Fleet
Early August 1943:
Arrives at Truk.
16 August 1943:
Departs Truk on her first war patrol to reconnoiter
the Espiritu Santo area.
25 August 1943:
At 1700, LtCdr Manabe reports sighting a convoy of six
transports off Espiritu Santo. It is the last signal received from RO-35.
E of the Solomons, 170 miles from Ndeni, Santa Cruz island. LtCdr A. F.
White's USS PATTERSON (DD-392) is screening a convoy of Task Unit 32.4.7 from
the New Hebrides toward the lower Solomon Islands. At 1912, White's radar picks
up a surface contact. PATTERSON is ordered to close and investigate. At
4,000 yards, the contact - a diving submarine - disappears. White's sonar
reacquires the target at 3,800 yards and PATTERSON commences dropping depth
charge patterns. At 2153, her crew hears a deep underwater explosion - probably
marking the end of RO-35 at 12-57S, 164-23 E. 
8 September 1943:
The Sixth Fleet at Truk attempts to contact RO-35.
2 October 1943:
Presumed lost with all 66 hands off Espiritu Santo,
New Hebrides Islands.
1 December 1943:
Removed from the Navy List.
 I-25 was lost in the same area around that time.
Somewhat confusingly, the USN Fleet Radio Unit, Melbourne (FRUMEL)
reported in June 1944 that RO-35 was making a supply run from Truk to Kusaie,
probably confusing her with RO-41.
Special thanks for help in preparing this TROM go to Dr. Higuchi
Tatsuhiro of Japan.
– Bob Hackett and Sander Kingsepp.
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