The bolts snap, the plot thickens.

California Transportation Department officials at a meeting of the Metropolitan Transportation Commission on Wednesday said that faulty bolts being used in the construction of a new span of the Bay Bridge might have been damaged by rainwater, reports KQED's Rachel Dornhelm.
They also said they can't promise the bridge will be ready for its scheduled Labor Day opening.
The bolts are intended to stabilize the bridge in the event of an earthquake. Earlier reports focused on the manufacturing process. In fact, some questions came up about the way the bolts were made by Dyson Corp. of Ohio, and hydrogen in the bolts appears to have made them brittle.
But engineers in the meeting raised a new possibility: The hydrogen could have come from rainwater gathering in the holes where the bolts sat after being installed.