Japanese submarine I-368

I-368 was an Imperial Japanese Navy Type D1 transport submarine. Completed and commissioned in August 1944, she served in World War II and was converted into a "kaiten" suicide attack torpedo carrier in January 1945. She was sunk in February 1945 while operating during the Battle of Iwo Jima.
Construction and commissioning.
"I-368" was laid down on 15 July 1943 by Yokosuka Navy Yard at Yokosuka, Japan, with the name Submarine No. 5468. She was renamed I-368 on 25 January 1944 and provisionally attached to the Sasebo Naval District that day. She was launched on 29 January 1944 and was attached formally to the Sasebo Naval District that day. She was completed and commissioned on 25 August 1944.
Service history.
Upon commissioning, "I-368" was assigned to Submarine Squadron 11 for workups. On 2 November 1944 she was reassigned to Submarine Squadron 7.
In January 1945, "I-368" was converted from a transport submarine into a "kaiten" suicide attack torpedo carrier, the conversion involving the removal of her deck gun and "Daihatsu"-class landing craft and their replacement with fittings allowing her to carry five "kaitens" on her deck, On 10 January 1945, she and the submarine took part in simulated "kaiten" attacks against towed targets in the Seto Inland Sea that lasted 15 days.
The Battle of Iwo Jima began on 19 February 1945 when U.S. forces landed on Iwo Jima. The landings had occurred sooner that the Japanese expected, so they ordered "I-368" to cease "kaiten" training early and formed the "Chihaya" "Kaiten" Group, made up of , , and the submarine , with orders to proceed to the waters off Iwo Jima and attack American ships there. On 20 February 1945, "I-368" became the first "kaiten" carrier to get underway for Iwo Jima, departing the "kaiten" base at Hikari.
"I-368" was dead in the water on the surface west of Iwo Jima at 03:05 on 26 February 1945 when a United States Navy Grumman TBM-1C Avenger torpedo bomber of Composite Squadron 82 (VC-82) operating from the escort aircraft carrier detected her on radar. The Avenger overshot "I-368" on its first pass, and she submerged. The Avenger returned and dropped a float light marker and sonobuoys, followed by a Mark 24 "Fido" acoustic homing torpedo. At 03:38, "I-368"′s conning tower briefly broke the surface near the float light marker, but she quickly dived again. Another Avenger arrived on the scene and dropped more sonobuoys and another Fido, which sank "I-368" at . All 86 men on board were lost.
On 6 March 1945, the Japanese ordered "I-368" to return to Japan, but she never acknowledged the order. On 14 March 1945, the Imperial Japanese Navy declared "I-368" to be presumed lost with all hands off Iwo Jima, although she nonetheless was officially transferred from Submarine Squadron 7 to Submarine Division 15 when Submarine Squadron 7 was deactivated on 20 March 1945. She was stricken from the Navy list on 10 April 1945.