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Ro-100 Class Submarine
525 Tons (surfaced)
60.90m x 6m x 3.51m
4 x torpedo tubes
(8 Type 95 torpedoes)
2 x 25mm AA guns
On January 16, 1943 this submarine was assigned to Rear Admiral Harada Kaku's SubRon 7 in SubDiv 13, in Vice Admiral Mikawa Gunichi's Eighth Fleet at Rabaul. Two days later, the submarine departs Yokosuka. On January 25, 1943 arrives at Truk.
First War Patrol
Second War Patrol
On February 22, 1943 RO-101's navigator, Lt Kondo Shigeshi, sights a 4,000-ton steamer. After examining the target by persicope, Orita determines that it is a "Q" ship - a merchant armed with hidden guns and depth charges. He decides to make a night attack, but the ship speeds away towards Port Moresby and escapes.
25 February 1943:
28 February 1943:
5 March 1943:
On March 7, 1943 south of Dampier Strait, Northern New Guinea. The RO-101 rescues survivors from the sinking of Nojima Maru including Captain Matsumoto Kametaro, CO and 44 IJA infantrymen from lifeboats.
8 March 1943:
13 March 1943:
On March 19, 1943 RO-110 departs Rabaul for an area south-east of Guadalcanal, but soon after departure most of the crew fall sick with food poisoning and the patrol is aborted.
21 March 1943:
5 April 1943:
12 April 1943:
30 April 1943:
21 May 1943:
8 June 1943:
17 June 1943:
29 June 1943:
30 June 1943:
2 July 1943:
3 July 1943:
8 July 1943:
12 July 1943:
At 1710, the TAYLOR drops two more depth-charges that render periscope No. 1 inoperable. The RO-101 remains submerged for the next two hours. The temperature aboard rises to +104 F (+40 C). Towards evening, the RO-101 surfaces and proceeds to the NW coast of Kolombangara Island for makeshift repairs.
Inspection of the boat indicates numerous dents in the hull and that the periscope must be replaced. After the sunset her crew heard heavy gunfire and saw searchlight beams (the Battle of Kolombangara). The RO-101 is ordered to rescue the survivors from the JINTSU, but can not execute it.
During the afternoon of July 13, 1944, while charging her batteries on the surface west of Shortland, RO-101 is attacked by a patrol plane forcing Orita to crash-dive. The plane drops two bombs, but misses but her second periscope is damaged and inoperable.
14 July 1943:
7 August 1943:
18 August 1943: The Battle off Horaniu:
Captain Thomas Ryan is dispatched to intercept the Japanese with the NICHOLAS (DD-449), O'BANNON (DD-450), CHEVALIER (DD-451) and the TAYLOR (DD-468). At 0040, a Japanese scout plane drops flares and illuminates the American destroyers 15,000 yards W of the convoy. Between 0046 and 0055, Ijuin's destroyers launch 31 torpedoes at the Americans, but Ryan turns into them and they all miss. Both sides open fire, but the range is long and the gunfire is ineffective. The convoy scatters. Admiral Ijuin withdraws to the NW. Ryan sinks two small subchasers, but the barges later rescue 9,000 Japanese troops from Kolombangara.
About 0100, in the RO-101, LtCdr Orita spots gunfire flashes to the north through his periscope. At 0200, his sound operator picks up destroyer screws coming down the "Slot". Orita quickly sets up and at a range of only 600 yards fires four torpedoes at the second destroyer, but they all pass astern! The destroyer is making 30 knots, much faster than Orita calculated.
20 August 1943:
26 August 1943:
28 August 1943:
1 September 1943:
4 September 1943:
Eighth War Patrol
On September 15 , 1943 at the south entrance to Indispensable Strait, this submarine attacks a convoy of two cargo ships en route to Espiritu Santo. At 1011, the convoy's escorts: USS MONTGOMERY (DD-121) and USS SAUFLEY (DD-465) sight a torpedo wake.
USS SAUFLEY begins to search down the track of the torpedo's wake. At 1251, she makes sonar contact at 3,000 yards. Over the next three and one-half hours, the SAUFLEY makes five depth charge attacks.
At 1443, the submarine surfaces. The SAUFLEY's five-inch batteries and machine guns open up on her conning tower. Overhead, Lt W. J. Geritz's PBY-5 "Catalina" patrol bomber of VP-23 joins the attack and drops two depth charges. The first charge misses, but the second hits.
At 1446, the submarine, probably the RO-101 disappears, then the destroyer's crew hears a heavy underwater explosion. By 1735, a diesel oil slick covers a square mile of the ocean at 10-57S, 163-56E.
On October 11, 1943, the submarine is presumed lost with all 50 hands in the Solomons. Finally, on December 1, it is removed from the Japanese Navy list.
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