An anti-gas shelter in the UK

Title card: "Poison Gas" superimposed on soldiers with the gas rolling over them / File footage: Tanks spraying gas behind them as they move forward / MS soldiers on slope run uphill / VS, wearing gas masks; they run through the gas / body of a fallen solder, with gas wafting around / planes fly in formation / VS people evacuate a building / numerous biplanes in flight / aerial London / side angle EXT Buckingham Palace, with the Royal Standard flying above // [London, 1936] men enter a gas shelter, take seats as another man closes one sealed airlock and then another / VS mechanisms to provide air and recirculate it; large bottles of oxygen; man's feet pedaling to provide power in the event of a power failure; tubes and ducts / a man in a gas mask enters the shelter, closes the airlock behind him, and removes his mask / hand lifts the receiver of a telephone / hand with dials on a radio / hand with a jug of water; a first aid kit sits nearby / hand takes wrench out of tool box / water pipe / planes fly away / Pathe rooster logo / Note: exact day not known