This hole was dug by the Ministry of Defence of Bulgaria, who excavated an area in the center of the village during a project active from 6 December 1990 to 19 November 1992.
As the secret "Operation Lightbeam" commenced, the psychics changed their opinion on what to find in Tsarichina several times.
[3][4] It was reported that one psychic committed suicide during the excavation and one involved officer killed himself after the end of the project.
[3] A 2007 bTV documentary on the Tsarichina project revealed that most of the military documents surrounding the event had disappeared from government archives or had since been destroyed.
[citation needed] Triumph is a 2024 dark comedy/social satire feature film based on the 1990s excavation of the Tsarichina Hole, written and directed by Kristina Grozeva and Petar Valchanov.