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I Have a Mansion in the Post-apocalyptic World (Web Novel) - Chapter 1273: Ultrasonic Fence
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Chapter 1272: Launching Ceremony
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Chapter 1274: Underground Encounter
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... would continuously transmit seismic waves of twelve different frequencies to create a “blank domain” with a range of ten kilometers underground. In this blank domain, Devil Worms would be unable to determine their direction and unable to distinguish the surrounding and surface conditions, while also experiencing strong discomfort.
The experts in the lab named the invention Ultrasonic Fence.
Twelve seismic wave excitation devices were deployed around the colony to form an ultrasonic ...
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