Mystery of Google barges moored off US coast
Mystery surrounds two barges that Google has moored off the coast of America.
The barges have a four-storey structure on deck and rumours are circulating about what the company plans to use them for.
One suggestion is that they could be turned in to floating data centres powered by wave action.
Others believe they could be fitted out with new showrooms for Google Glass with a "party deck" on top.
A barge with four levels of shipping containers on board is moored in San Francisco Bay
So far Google has declined to comment on what the the vessels are being used for.
"It's an interesting concept," said Nick Layzell, of Telehouse, a data centre provider.
"Cooling is the big cost for any data centre, so perhaps they're trying to take advantage of having some water on tap."
But he added that water was the biggest threat to data centres because of the damage it could cause to equipment.
One of the barges is anchored at Pier 1, Treasure Island Marina in San Francisco.
The authority in charge of projects within San Francisco Bay confirmed that it had met with Google officials several times in recent months. Its chief executive Larry Goldzband said that Google had been "less than specific" about its plans.
"When they decide to let us know what they plan to do with it, or hope to do with it, then we can decide if it's allowable," he told AP.
Documents revealed following a freedom of information request by the The Day newspaper in Connecticut show Google is also linked to a barge off the coast of Maine.
According to the paper, the documents did not explain what the barge would be used for but detailed a plan to "operate" the barge in different ports around the United States starting in New York.