Burrowing animals such as shipworms and zebra mussels can destroy wood underwater, making dating impossible. Here, underwater trees in the Great Lakes may not be subject to shipworms, zebra mussels ... more 
Burrowing animals such as shipworms and zebra mussels can destroy wood underwater, making dating impossible. Here, underwater trees in the Great Lakes may not be subject to shipworms, zebra mussels are slowly eating through the wood. less 
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LiveScience.com | Photo By Captain Luke Clyburn
Tue, Jul 30, 2013 10:20 AM EDT