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Woman saying, "Lockdown"
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Woman saying, "Will the plant nurse please report to column B77"
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Man saying, "Lockdown"
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Industrial floor sanding machine switching on, in operation then switching off and spinning down slowly
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Man saying, "Lockdown"
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Man saying, "North gate is secure"
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man saying, "This is a drill", pa announcement
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Woman saying, "Patrol is needed in the north lot", filtered
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Multiple short revving bursts of industrial air gun in operation
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Man saying, "Repeat"