In Darkest Hour, what was the sound each time the date changed?

In Darkest Hour, several times the date appears onscreen as a graphic, and it switches from one date to another. The change is accompanied by the sound of an egg timer's "ping", and then a heavy mechanical sound. What are these sounds supposed to be, and why were they used?

EDIT

The first instance of this happens at 5:25 (starting from when the "Focus Features" logo appears onscreen).

sound-effects darkest-hour

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In Darkest Hour, what was the sound each time the date changed?

Pictures about "In Darkest Hour, what was the sound each time the date changed?"

Darkest Hour (2017) - We Shall Fight on the Beaches Scene (10/10) | Movieclips

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