In the early days of World War I, Germany, determined to bring its British enemies to their knees, launched a new kind of terror campaign: bombing civilians from the sky. The aircraft delivering the lethal payloads weren't planes, they were Zeppelins, enormous airships, some the length of two football fields. With a team of engineers, explosives experts, and historians, NOVA investigates the secrets behind these deadly war machines.

Originally broadcast as an episode of Nova in January, 2014. Produced by Ian Duncan and Johnny Shipley ; director of photography, Mike Coles ; editor, Paul Shepard ; original music, Alasdair Reid.