A search is underway along the Chesapeake Bay Bridge-Tunnel in Virginia for the driver of a box truck that fell off the bridge and into the water.The accident was reported just before 8:30 a.m. in the water near Virginia's Eastern Shore. Members of the U.S. Coast Guard and the Virginia Beach Fire Department are looking for the driver.Witnesses told officials they saw the driver leave the truck. It's unclear whether the search is a rescue or recovery mission.