Seven unexploded bombs have been found on the seabed of The Wash by contractors building an off-shore wind farm.
Dong Energy is installing 75 wind turbines on Race Bank, near Skegness, and the power will be transmitted along the seabed to Walpole substation.
A spokesman for the company says this is standard procedure.
He said: “A pre-construction survey for the Race Bank offshore wind farm has so far identified a number of confirmed incidences of unexploded ordinance (UXO), with other possible cases still being checked.
“Following approved procedures, confirmed UXOs are marked with buoys and then, subject to permission being granted by the Marine Management Organisation, they will be safely detonated by a specialist contractor.”
Dredging boats have been moored at Lynn.