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Google's Barge in the Bay

A security gate is seen in front of a barge, at left, on Treasure Island in San Francisco.

Google's freaking everyone out with this secretive barge

The barge is one of three mysterious floating structures that have

sparked online speculation. The secretive structures, two in San

Francisco and one Portland, Maine, are registered with a Delaware

corporation as BAL0001, BAL0010, BAL0011 and BAL0100.