A six-part series celebrating the role of engineering in modern society.

What do an ejector seat, a ring-pull can and a fire-extinguisher have in common? Each of these devices is called upon to work only once and must do so without fail.
None of them has a function until the crucial moment.
Using slow motion, elaborate graphics and split-second timing, the programme demonstrates how this all-or-nothing performance stretches engineering skills to the limit.

(Teletext subtitles: page 888)
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