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Based on this article it sounds as if digging in the desert would be quite difficult.I think if Nancy is deceased, it would make sense that her body has been buried in the desert. This keeps the body "safe" from animals or weather conditions etc.
Ala "Breaking Bad" and Hank's (the DEA agent) demise, the perps buried him and then noted the coordinates.
If someone pays the ransom re NG's body,
(Not a live one) the perps would be able to give them the coordinates of where she was buried.
Caliche – natural concrete, can you dig it?
If you try to dig a hole in your yard in Tucson, chances are that you will soon hit a very hard, almost impenetrable layer. The term “caliche” is a colloquial word that means different things in different places. In the Sonoran Desert, it means a mixture of gravel, sand, clay and other desert...
The term “caliche” is a colloquial word that means different things in different places. In the Sonoran Desert, it means a mixture of gravel, sand, clay and other desert debris cemented by porous calcium carbonate and is more properly called a calcic horizon. These calcic horizons generally occur two to four feet below the surface and can be inches to many feet thick. Caliche forms only in arid and semi-arid areas. In Tucson, with an average annual rainfall of 10 to 12 inches, caliche forms more than ten inches below the surface.