A tractor-trailer hit a light pole and went over the side of the Chesapeake Bay Bridge-Tunnel into the water this morning.
The truck went over the side at mile marker 15, said Virginia Beach Fire Department Battalion Chief Amy Valdez.
Navy divers had located one person in the water who was unresponsive, but no other details were available about that person, according to the Coast Guard.
The Navy had a helicopter at the scene, along with the divers, according to the Coast Guard. A Coast Guard helicopter also was on scene along with the cutter Beluga and some small boats from Little Creek.
Only one person was believed to have been inside the truck.
A tow line had been attached to the cab and container to keep control of it while rescuers were working around it, Valdez said. The rig had been drifting in the water.
All northbound lanes are closed.