A generation before the famous Nazi blitz of London during WWII came the first aerial terror bombings of London by German zeppelins during WWI. Monstrous machines two football fields long filled with flammable hydrogen gas carried tons of explosives over the unprotected capitol. Explore these deadly creations with historians and engineers who delve deep into these terrifying war machines. 2014/color/60 min/NR/widescreen.