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Siren - unpleasant distortion

Call & response - Alien technology

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Warning siren - Sci-fi

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Alert - apocolyptic siren

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Alien noise - glitchy

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Futuristic spaceship landing

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Alien spacecraft engine idle

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Spaceship landing - Alien

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Drone - short alien hum

0:07

Futuristic siren drone

0:16

Alien technology - robot greeting

0:00

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