Air raid rehearsal at a radio factory in Southend in Essex.
Rehearsal at a factory in case of an enemy air raid.
Full titles read: "INDUSTRIAL ARP [AIR RAID PRECAUTION]"
L/S's of hundreds of women workers in a radio factory in Southend, Essex. An air raid siren sounds and the workers promptly leave their posts and go outside. L/S's of the women going inside large underground bunkers wearing gas masks. M/S from inside the bunker. L/S's of biplanes flying over and dropping fake bombs