Sound: Summary
High intensity sound 20–100 Hz, and high intensity impulse noise, are promising as a non-lethal weapon, but more testing is needed. As a source of high-intensity 20–100 Hz sound, the sound generated by a plasma sound source is promising.
The US Navy Diving Manual(page 24) says that high-power low-frequency sonar (commonly used for depth sounding and to detect large objects (including submarines)) is not good at detecting small objects like divers, but is hazardous to divers. At high enough power it could be a reliable lethal anti-diver weapon.
Read more about this topic: Anti-frogman Techniques, Anti-frogman Weapons, Sound
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