In the next year or two, the seabed between Hampton and Norfolk will start to change. Mud and sand will slowly move as a custom-built boring machine tunnels alongside the Hampton Roads Bridge-Tunnel. Travelers funneling through the existing HRBT may not notice the adjacent construction just on the other side of the tunnel wall. Cargo ships and Navy vessels, carrying thousands of containers and sailors, may pass over the project’s construction completely undisturbed. And that’s the way Hampton Roads Transportation Planning Organization officials want it to stay. “It’s something we’re really proud of,” said Robert Crum, executive director for the...