Nuclear weapon
The film then switches to [[live-action|live footage]], as narrator Middleton explains what children should do "when you see the flash" of an [[Nuclear weapon#Fission bombs|atomic bomb]]. The movie goes on to suggest that by ducking down low in the event of a [[nuclear explosion]], (crawling under desks and covering their necks with clasped hands) the children would be safer than they would be standing, and explains some basic survival tactics for nuclear war (facing any wall that might lend protection).