The exhumation of Yagan's head was the result of a geophysical survey and archaeological dig at a grave site in the Everton Cemetery, Liverpool in 1997.
Yagan was an Aboriginal Australian warrior of the Noongar nation who played a key part in early indigenous resistance to European settlement and rule around the area of Perth, Western Australia.
The ground penetrating radar yielded no information about the location of Yagan's head, as the highly disturbed graveyard soil contained many reflecting sources.
[3][4] After gathering evidence on the position and depth of Yagan's head, Bates reported the survey results to the Home Office, which eventually granted permission to proceed with the exhumation.
[3][4] The following day, a forensic palaeontologist from the University of Bradford positively identified the skull as Yagan's, by correlating the fractures with those described in an 1834 report by Thomas Pettigrew.