For almost a week now, the internet's been trawling the depths of its imagination trying to figure out what the heck Google is doing building barges. Obscure patent documents suggest they're floating data centers. Local reporters think they're clandestine Google Glass stores. But nobody really has a clue.
On Wednesday, the Coast Guard boarded one of the mystery barges, docked at Treasure Island near San Francisco—there's also one in Portland, Maine, and there are two that are unaccounted for. It was a brief visit, and they haven't offered any clues as to what the barge is for or what the Coast Guard might have been looking for—probably because they'd signed nondisclosure agreements.