It was moved to the outer perimeter of the BAE Systems shipyard by barge.

BBC: HMS Queen Elizabeth final section leaves Portsmouth

Nato said that the attackers succeeded in breaching the outer perimeter of the base but no coalition soldiers were killed in the incident.

BBC: Militants kill Afghan policemen at Kandahar checkpoint

Topped with rolls of barbed wire, it doubles up in places to form both an inner and an outer perimeter, with a strip of concrete in between for guards to patrol along.

NPR: North Korea Nuke Test Could Test China's Patience

The weight of the building is supported entirely by 12 stout outer columns, which form the square perimeter of the building, plus four inner columns at the corners of a smaller, inner square.

ECONOMIST: AN ENGINEERING MYSTERY