Japanese submarine I-363
I-363 was an Imperial Japanese Navy Type D1 transport submarine. Completed and commissioned in July 1944, she served in World War II and conducted transport missions between Japan and outlying islands until she was converted into a kaiten suicide attack torpedo carrier. She survived the war, but sank after striking a mine in the weeks immediately following its conclusion.
Construction and commissioning
I-363 was laid down on 1 May 1943 by Kure Naval Arsenal at Kure, Japan, with the name Submarine No. 5463. She was renamed I-363 on 20 October 1943 and provisionally attached to the Yokosuka Naval District that day. She was launched on 12 December 1943 and was completed and commissioned on 8 July 1944.Service history
Upon commissioning, I-363 was attached formally to the Yokosuka Naval District and was assigned to Submarine Squadron 11 for workups. She departed Hikari on 8 August 1944. With her workups complete, she was reassigned to Submarine Squadron 7 on 15 September 1944.Transport missions
On 9 October 1944, I-363 departed Yokosuka bound for Mereyon Island at Woleai in the Caroline Islands on her first transport mission, carrying 75 metric tons of food and supplies and 15 metric tons of other cargo. En route, he stopped at Truk from 21 to 24 October 1944, where she picked up another 10 metric tons of cargo for Mereyon consisting of food and uniforms. She arrived at Mereyon on 28 October 1944, unloaded five tons of fuel and supplies, embarked seven passengers, and got back underway the same day. She returned to Truk on 31 October 1944, unloaded 33 metric tons of fuel oil, embarked 83 Imperial Japanese Navy Air Service personnel, and put back to sea on 2 November 1944 bound for Yokosuka, which she reached on 15 November 1944. She got underway from Yokosuka on 30 November 1944 for a training exercise, but returned the same day after her commanding officer suffered an injury.I-363 departed Yokosuka on 10 November 1944 for her second transport voyage carrying a cargo of 88 metric tons of food, 10 metric tons of ammunition, and 10 metric tons of other supplies, this time setting course for Marcus Island, which she reached on 17 November 1944. After unloading her cargo and embarking 60 passengers, she left the same day bound for Yokosuka, where she arrived on 26 December 1944. She then began an overhaul.
With the overhaul complete, I-363 put to sea from Yokosuka on 5 March 1945 for her third supply voyage, again bound for Marcus Island. She arrived at Marcus on 13 March 1945, unloaded her cargo, and headed back to Yokosuka. During her voyage, Submarine Squadron 7 was deactivated on 20 March 1945 and she was reassigned to Submarine Division 15. She reached Yokosuka on 30 March 1945.
''Kaiten'' carrier
While I-363 was on her return voyage from Marcus Island, U.S. forces captured advanced bases and anchorages in the Kerama Islands southwest of Okinawa between 26 and 29 March 1945, and shortly after her arrival at Yokosuka, the Battle of Okinawa began when U.S. forces landed on Okinawa itself on 1 April 1945. After reaching Yokosuka, I-363 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,First ''kaiten'' mission
By 28 May 1945, I-363 was part of the Todoroki ''Kaiten Group along with the submarines,, and. With five kaitens on board, she got underway from the kaiten base at Hikari that day bound for a patrol area between Okinawa and Ulithi Atoll.On 15 June 1945, I-363 sighted a convoy southeast of Okinawa. With the seas too rough for her to launch her kaitens'', she attacked with conventional torpedoes instead. Her commanding officer believed she sank one merchant ship, although in fact she inflicted no damage. On 18 June, she received orders to end her patrol and proceed to Hirao, Japan, which she reached on 28 June 1945. She moved on to Kure on 29 June 1945.