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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A natural explanation for strange explosion at Salty Brine Beach ?

  

  I  thought there was a natural explanation for the strange explosion at Salty Brine beach . Hydrogen released by a corroding underground copper cable reacting with salt water sounds quite plausible. But after watching a hydrogen gas experiment on You Tube ( see " The Periodic Table of Videos " , hydrogen ) I question that " a hydrogen explosion would generate no flames or heat ". Recall the famous German Zeppelin Hindenburg disaster in 1939 ? Also we have seen a few hydrogen bomb experiments. Can hydrogen " explode " less dramatically -without oxygen ?
Just a footnote to Salty Brine Beach. They just had the colorful " Blessing of the Fleet " there. Why did they change the name of Galilee Beach- a beautiful Biblical name - to honor a radio celebrity- the man of a million commercials and " No school in Foster-Glouster " ? They could have named the Rhode Island Mall after the Old Salt.

• A plausible explanation for Salty Brine Beach explosion ?