(KS type RO-109 scanned from "Submarines of the Imperial Japanese Navy" by Polmar and Carpenter)

IJN Submarine RO-116:
Tabular Record of Movement

© 2001-2012 Bob Hackett & Sander Kingsepp
Revision 2

16 January 1943:
Kobe. Laid down at Kawasaki Jyuko, K.K. as a 525-ton Kaisho (KS) Type submarine No. 407.

5 July 1943: (add new entry) Redesignated RO-116 and tentatively attached to Yokosuka Naval District. 13 September 1943:
Launched as RO-116.

21 January 1944:
Completed and attached to Yokosuka Naval District. LtCdr Okabe Takeshi (63)(former CO of RO-59) is appointed the CO. Assigned to SubRon 11.

28 March 1944:
Arrives at Tokuyama Fuel Depot. Refuels.

29 March 1944:
Departs Tokuyama.

31 March 1944:
Departs Japan on her first war patrol with RO-117 to intercept an enemy task force reported in the Palau area.

15 April 1944:
Returns to Japan.

4 May 1944:
Reassigned to SubDiv 51 of Rear Admiral Owada Noboru's (former CO of YAMASHIRO) SubRon 7 in Vice Admiral Takagi Takeo's (39) (former CO of MUTSU) Sixth Fleet (Submarines).

10 May 1944:
Arrives at Saipan.

15 May 1944:
Departs Saipan to form a picket line N of the Admiralty Islands to warn of American invasion forces approaching the Palaus.

18 May 1944:
The U. S. Navy intercepts radio traffic that indicates the Japanese have established a new submarine picket "NA line" between Truk and the Admiralty Islands to intercept American carriers. LtCdr Walton B. Pendelton's USS ENGLAND (DE-635) departs Purvis Bay, off Florida Island, Solomons with LtCdr James Scott's USS RABY (DE-698) and LtCdr Fred W. Just's GEORGE (DE-697) as a hunter-killer group to attack the NA line.

24 May 1944:
N of the Admiralty Islands. GEORGE makes a radar contact at 14,000 yards, but the contact disappears from her screen. At 0150, ENGLAND makes a sonar contact. The submarine commences evasive actions. After two aborted attack runs, LtCdr Pendelton fires a salvo of twenty-four ahead-thrown Mark 10 "hedgehog" projector charges. At least three hit and sink RO-116 at 00-53N, 149-14E.

25 June 1944:
Presumed lost with all 56 hands.

10 August 1944:
Removed from the Navy List.

Authors' Note:
Thanks for assistance go to Mr. Jean-François Masson of Canada and Matthew Jones of the USA. Thanks also go to Dr. Higuchi Tatsuhiro of Japan and Steve Eckardt of Australia.

– Bob Hackett and Sander Kingsepp

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