Using cadaver dogs, heavy equipment and ground-penetrating radar, they hope, finally, to find his body.
In previous visits to the dunes he made some preliminary finds, but this time his team used ground-penetrating radar to look for the remains.
The cemetery was discovered in 2002 using ground-penetrating radar.
The team used a ground-penetrating radar to locate a small buried house.
Don Boothby ran his ground-penetrating radar over and around the anomaly.
The team used ground-penetrating radar and excavations to identify where bodies are buried.
Surveys with ground-penetrating radar had led the team to think the coffins were six feet deep.
At certain sites, ground-penetrating radar was used to look for underground structures or buried equipment.
That would make possible power-hungry instruments like ground-penetrating radar to look at what lies beneath the surface.