Aeroflot Flight 6515 crashes off Syvash, killing all 26 people aboard.

Aeroflot Flight 6515 was an scheduled flight operated by Aeroflot that crashed on October 23, 1978, in Sivash Bay due to engine failure caused by icing and crew error, resulting in the deaths of all 26 people on board.

The Syvash or Sivash, also known as the Putrid Sea or Rotten Sea, is a large area of shallow lagoons on the western edge of the Sea of Azov. Separated from the sea by the narrow Arabat Spit, the water of the Syvash covers an area of around 2,560 km² (990 sq mi) and the entire area spreads over about 10,000 km² (3,900 sq mi). The Henichesk Strait is its eastern connection to the Sea of Azov. The Syvash borders the northeastern coast of the main Crimean Peninsula. The central and eastern Syvash were registered as wetlands of Ukraine under the Ramsar Convention. Since the 2022 Russian invasion of Ukraine, the entire Syvash has been occupied by Russia.

October 23 is the 296th day of the year in the Gregorian calendar; 69 days remain until the end of the year.