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Easements are aimed less at would-be terrorists than unlucky construction crews.

You think that evildoers might not only be able to conduct an excavation so difficult that it stymied the US military, but that they’d be able to do it without attracting official attention?

If the US military couldn't find it when the scene was fresh, what's the likelihood someone could establish a large and sufficient enough excavation operation to find it, and remove it, before somebody bothered to go "what's all that ruckus about" and call the US military?

I am now expecting to see a movie/TV series with what you described as the plot.

The site is close to main road and farmhouse. The farmer who owns the field is definitely going to notice the heavy equipment. Assuming the coordinates are right, Google Maps shows that there is a stand of trees in middle of field.