The idea of taking a plane from the skies and burying it undergrownd is that of British contemporary artist Roger Hiorns, to symbolize the end of an era, a symbolic act of saying good-bye to an era of development represented by the MiG planes.

https://english.radio.cz/british-artist-buries-mig-21-fighter-jet-symbolize-end-era-8180523

2 years later the country changed it's mind and exhumed it.

 

https://www.jetphotos.com/photo/9321480