North Korea’s newest cross-border weapon is noise (youtube.com)
Terrorism noise from loudspeakers. About 65db near the border (72 at the border fence). Sounds like downtown Medellin.
SKoreans living nearby have reported health issues, such as kids and adults not sleeping, developing mouth sores, dozing off at school. They nap on the bus to school.
SKorea has responded by doing the same.