Construction materials were declared banned due to their possible use to build bunkers.

I will build bunkers if it is my commander's wish.

"It's a good place to build bunkers, and bin Laden knows that."

They hid in barns and built bunkers under the forest soil.

Concrete used to build bunkers on the region's beaches travelled through the station.

If you mandate too much, then we'll be building concrete bunkers.

He added that the new arms might dissuade an enemy from ever building deep bunkers.

"We feed, clothe and build bunkers for the people," he said.

"Which brings up a point: I see that your people are building bunkers from sandbags."

They built pillboxes on the beach, bunkers further inland, and an underground hospital.