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B1 Type submarine
2,584 Tons (surfaced)
3,654 Tons (submerged)
356' 6" x 30' 5" x 16' 7"
6 x 21" torpedo tubes
with 17 torpedoes
1 x 140mm deck gun
E14Y Glenn (deck hanger)
Built by Mitsubishi Kobe Yard at Kobe. Laid down February 3, 1939 as B1 Type submarine No. 42. Launched June 8, 1940 as イ-25 (I-25). Assigned to LtCdr Tagami Meiji as chief equipping officer. Commissioned October 15, 1941 in the Imperial Japanese Navy (IJN) assigned to LtCdr Tagami Meiji attached to Yokosuka Naval District.
On October 31, 1941 assigned to the Sixth Fleet, SubDiv 4, SubRon 1 as flagship for the division. On November 7, 1941 at Sukumo Bay off Shikoku embarks a E9W1 Type 96 floatplane Slim and the crew led by CPO Fujita Nobuo and begins floatplane launch and recovery training in the Inland Sea.
First War Patrol
On November 11, 1941 assigned to the advance force for Operation Z the attack against Pearl Harbor and Oahu. On November 21, 1941 departs Yokosuka on her first war patrol to Hawaii. On December 5, 1941 arrives northwest of Oahu and at 2:30pm spots eight U.S. aircraft headed eastward and I-25 dives to 100' to avoid being spotted.
On December 7, 1941 during Operation Z patrols northeast of Oahu on the eastern station forming a patrol line with Japanese submarines I-17, I-9, I-15. At 12:45pm, the sound man aboard I-25 reports sounds of explosions from Oahu from the attack.
The I-25 operated off the west coast of the United States sinking two American freighters and damaging another. With only one torpedo remaining, Captain Tagami was preparing to conclude his patrol.
On March 8, 1942 off Wellington launched E14Y Glen piloted by W/O Fujita Nobuo that overflew the city and returned safely. Afterwards, proceeded to Auckland. On March 13, 1942 during the night the same floatplane piloted by W/O Fujita Nobuo flies over the city and returns safely.
On October 4, 1942, I-25 sinks tanker SS Camden off Coos Bay on the southern coast of Oregon.
On October 11, 1942 in rough seas spots two targets on the 500 miles west of Seattle. Initially, they were mistaken as "two battleships" and later "two submarines". At 11:00am I-25 fires her last torpedo that hits 30 seconds later causing several explosions sinking Soviet Submarine L-16 the explosions were near enough to damage a toilet aboard I-25.
On July 25, 1943 departs on her seventh war patrol with Captain Miyazaki Takeji to conduct an aerial reconnaissance over Espiritu Santo.
On August 23, 1943 I-25 launches her E14Y Glen floatplane on a reconnaissance mission over Espiritu Santo and observes "three battleships" and smaller vessels. The next day, reports the observations by radio, this was the last message received from I-25.
On August 25, 1943 while escorting a convoy bound for New Hebrides, the radar aboard USS Patterson DD-392 makes contact with a submarine and closes to 4,000 yards before crash dives. Picked up on sonar, the destroyer releases depth charges and likely sinks the I-25 at roughly Lat 13° 10S, Long 165° 27E.
Meanwhile, the Japanese Navy was unaware of the loss of the submarine for weeks. On September 16, 1943 I-25 is ordered to make a reconnaissance flight over Suva on Fiji four days later, but the submarine does not acknowledge receipt of the order. Officially declared lost with the entire crew of 100 in the Fiji area. Officially removed from the Navy list on December 1, 1943.
Combined Fleet - I-25 Tabular Record of Movement
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