Reuters

Google's mystery barge

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A barge built with four levels of shipping containers is seen at Pier 1 at Treasure Island in San Francisco, October 28, 2013. How badly does Google want to keep under wraps a mysterious project taking shape on a barge in San Francisco Bay? Badly enough to require U.S. government officials to sign confidentiality agreements. REUTERS/Stephen Lam

A barge built with four levels of shipping containers is seen at Pier 1 at Treasure Island in San Francisco, October 28, 2013. How badly does Google want to keep under wraps a mysterious project taking shape on a barge in San Francisco Bay? Badly enough to require U.S. government officials to sign confidentiality agreements. REUTERS/Stephen Lam

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A barge built with four levels of shipping containers is seen at Pier 1 at Treasure Island in San Francisco, October 28, 2013. REUTERS/Stephen Lam

A barge built with four levels of shipping containers is seen at Pier 1 at Treasure Island in San Francisco, October 28, 2013. REUTERS/Stephen Lam

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A barge built with four levels of shipping containers is seen at Pier 1 at Treasure Island in San Francisco, October 28, 2013. REUTERS/Stephen Lam

A barge built with four levels of shipping containers is seen at Pier 1 at Treasure Island in San Francisco, October 28, 2013. REUTERS/Stephen Lam

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A barge built with four levels of shipping containers is seen at Pier 1 at Treasure Island in San Francisco, October 28, 2013. REUTERS/Stephen Lam

A barge built with four levels of shipping containers is seen at Pier 1 at Treasure Island in San Francisco, October 28, 2013. REUTERS/Stephen Lam

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A barge built with four levels of shipping containers is seen at Pier 1 at Treasure Island in San Francisco, October 28, 2013. REUTERS/Stephen Lam

A barge built with four levels of shipping containers is seen at Pier 1 at Treasure Island in San Francisco, October 28, 2013. REUTERS/Stephen Lam

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A barge built with four levels of shipping containers is seen at Pier 1 at Treasure Island in San Francisco, October 28, 2013. REUTERS/Stephen Lam

A barge built with four levels of shipping containers is seen at Pier 1 at Treasure Island in San Francisco, October 28, 2013. REUTERS/Stephen Lam

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