Navy beginning $200 million restoration effort on Norfolk sub dry dock

The Navy yesterday said it began a $200 million, three-year renovation effort on a dry dock at Norfolk Naval Shipyard.

"During its renovation, two-and-a-half feet of concrete will be replaced from the dry dock's floor, as well as two feet from the sidewalls. In addition to replacing the dry dock caisson, there will be a complete restoration of the pumpwell while upgrading all mechanical and electrical equipment," according to a Navy statement.

"To complete the massive overhaul, approximately 2,300 linear feet of mechanical and electrical services in the dock area will be replaced," the statement continues.

The facility being renovated, Dry Dock 4, is primarily responsible for servicing the Navy's submarines.

The project is part of the service's Shipyard Infrastructure Optimization Program, a $21 billion plan spanning two decades to improve the four public shipyards.