From 1972 to 1973, the Cathedral authorities undertook work to renovate the Holy Cross chapel. As part of this project, permission was given by the Archbishop of Kraków,
Karol Wojtyła the future Pope John Paul II to open the tomb of Casimir and Elizabeth in May 1973. The work was undertaken by a team of 12 conservators and their initial aim was to examine the contents of the tomb in order to assess how best to renovate it. When the tomb was opened, the team found rotting wooden coffins and the remains of Casimir and Elizabeth. The restoration work was then carried out and, once it had been completed, Casimir and Elizabeth were re-interred in a ceremony held in the cathedral on 18 September 1973, with Archbishop Wojtyła conducting the service. In the following months, members of the conservator team began to die prematurely and unexpectedly: Feliks Dańczak died in April 1974, Stefan Walczy in June 1974, Kazimierz Hurlak in August 1974, and Jan Myrlak in May 1975. Other premature deaths soon followed and 10 of the 12-man team died prematurely. The global media made comparisons with the
supposed curse linked to the premature deaths of those involved in the
discovery of the tomb of Tutankhamun in 1922, and rumours of a "Jagiellonian curse" began to circulate. The global notoriety of the story was boosted by the election of Archbishop Wojtyła as Pope in 1978, as his officiation at Casimir's re-interment was one of the few "background" film clips of the new Pope available to the international media. However, microbiologist identified the presence of the fungus
Aspergillus flavus in samples taken from the tomb. This type of fungus produces toxic substances called
aflatoxins which are linked to a number of serious health conditions affecting the liver and are highly
carcinogenic. Media reports have suggested that the likely cause of the deaths were the aflatoxins produced by this fungus.
The Times reported that it is thought that the conservator team members had inhaled the toxic
spores of the fungus as they opened the tomb. ==Cultural depictions==