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		 Ok... Here's the best theory i can come up with:  
 
 2 seasons ago they shipped in newly demolished boulders to rebuild the short wall jetty.  To creates the boulders, they drill a series of holes into massive rock and drop explosives into them.  
 My best guess is a left over, undetonated explosive sitting in a drill hole of one of the boulders. 
Posted from my iPhone/Mobile device 
		
		
		
		
		
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