Full title reads: "Portsmouth. End of 'Palmerston's Folly'. The Royal Engineers built them in 1871 and men of the same regiment, now destroy them to clear ground for Portsmouth's Municipal Aerodrome."

Portsmouth, Hampshire.

Two soldiers of the Royal Engineers regiment fill a hole in a building with tightly packed sandbags. Pan to soldier drilling a hole in the ground. An officer comes to check their work.

An officer and soldier prepare the plunger to set off explosives.

A concrete bunker explodes. The explosion sends smoke and dust up into the air.

LS of officers inspecting the bunker after the explosion.

Pan around remains of the bunker.