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Well, I suppose there will be the remains of structures both over- and underground; some ruins are likely to be covered by such dense and impenetrable jungle that it took the lidar method to detect them, others will just be mounds of rubble, and yet others may be buried underground reasonably intact.
Oliver Schick
@Sumo
I can't work out whether they mean there's something buried under the ground or it's just the remains of a structure.