What's inside Tonga's ancient tombs? Remote sensors probe Tu'i Tonga's grave

Archaeologists who are working on a project to map Tonga's ancient terraced tombs this week began the first laser imaging and remote sensing work to be conducted in Tonga, and they aim produce a three dimensional graphic map of Lapaha as as it was during the reign of the Tu'i Tonga from the 13th century to 1885.