What Mysterious Object Is Buried Under Seattle? - Presented by: The Aol. On Network

Construction of a tunnel underneath downtown Seattle was halted this week. As a giant tunnel-drilling machine named Bertha was blocked by a mysterious unknown object only 1000 ft into the project. Now, experts are scrambling to figure out just what on earth is blocking Bertha. Is it a man made object from a 200 year old landfill or a boulder left behind by a glacier thousands of years ago?

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