[4] The convoy was running parallel to Convoy Hi-81 which had left Imari on 14 November 1944 destined for Formosa to benefit from air cover provided by HI-81's escort carrier Shin'yō which was carrying fourteen Nakajima B5N "Kate" torpedo bombers of the 931st Air Squadron, Saeki Naval Air Station.

[5] On 17 November 1944, in the Yellow Sea off Cheju Island, MI-27 was spotted by the US submarines Sunfish and Peto which were operating in a wolfpack with Spadefish.

[4] Nearby, Spadefish spotted Shin'yō of HI-81 and fired six torpedoes four of which hit causing the carrier to burst into flames and sink (killing 1,130).

[4] After losing four of the eight ships being escorted, the remainder of convoy MI-27 arrived at Sijiao Island on 19 November 1944.

[4] On 29 March 1945, she was attacked and sunk by Consolidated B-24 Liberators with the Fifth Air Force while docked in the port of Takao, Taiwan at 22°40′N 120°15′E / 22.667°N 120.250°E / 22.667; 120.250.