All those copper cables in the ground-buried treasure for enterprising thieves

How do they know an explosive device did not wash out to sea in the tide?
What would their explanation have been if they had not found a cable in the area?

                                        Scientific spectrum-spectrograph evidence is a very powerful tool. So I guess an explosive device can really be ruled out. But think of all those corroding copper cables buried underground? Things made of copper in, on or about buildings are constantly being stolen or ripped off. They are treasure for enterprising thieves.
The state here is neglecting buried treasure ! Someone should invent a metal detector for copper. My walks on the beach might be more profitable-even for an old socialist. Send the money to the Bernie Sanders campaign. 

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