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Adding to the mystery, a second similar barge was recently spotted in Portland, Maine, and is also registered to By and Large LLC, according to local media reports.

The company itself is keeping mum, refusing even to acknowledge its affiliation with the vessels.

Secrecy is a standard business practice in Silicon Valley, where technology companies such as Apple Inc go to great lengths to keep their latest gadgets under wraps and a constellation of blogs compete to reveal highly prized details.

But the concealment effort surrounding the barge is in another league. Chain-link fences and security guards encircle a pier and a couple of nearby buildings on the island, which sits between San Francisco and Oakland.

A California state inspector, who said he had business in the hangar-like Building 3 where some of the early construction took place, told Reuters he had to surrender his mobile phone and sign a confidentiality agreement in order to enter.

Bob Jessup, a construction company superintendent who works in a building across the street, said Google spent the past year working on the project. He said they fenced off a wide area and brought in at least 40 welders a day, who worked around the clock and refused to say a word.

It was a phenomenal production. None of them would tell us anything

“They wouldn’t give up any of the information,” Jessup said. “It was a phenomenal production. None of them would tell us anything.”

He said they worked on the inside and the outside of the shipping containers, outfitting them with electronics – “very hush hush” – and then loaded them onto the barge with a crane. They put sides on the containers, with glass windows in some of them. They had to weld them very precisely so they could stack, Jessup recounted.