Workers replacing a water main in East Sussex have been delayed after unearthing the remains of World War II tank traps.
South East Water said the concrete traps were discovered during excavation work in Buckle Close, Seaford.
The traps were laid to stop the advancement of the German army if they were to mount an invasion.
David Brend, the delivery manager, said the £280,000 project to upgrade the water main had been delayed.
He said: "It is always interesting when relics of the past are uncovered by our excavations.
"However these sorts of discoveries do have an impact on the progress of our schemes."