April 10, 2022
Archaeologists have excavated six stone spheres created by the Diquis culture at the Costa Rica site of Finca 6. The spheres were deteriorating due to humidity, floods from hurricanes and tropical storms. The team cleaned and stabilized the spheres with edging and patching with lime-sand mortar to increase hardness and to place protective layers of mortar on the spheres. The spheres were re-buried under gravel and sand to protect against temperature and humidity and to prevent vegetation carrying acid to the spheres below.
Heritage Daily has the report here;