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You are looking for anything
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that would indicate recently laid masonry.
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We will be timing this.
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I will blow my whistle as such.
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We will then shout her name
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in unison from all areas of the tunnels.
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Emily!
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There'll be a pause of ten seconds of absolute silence
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when we will listen for the smallest sound,
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anything to indicate movement from behind the walls.
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If an officer detects something,
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he will blow his whistle