Hydrosonic?
Should be Hyper-sonic, POTUS misspoke.
POTUS doesn't "misspeak"
Hydra = Water
Sonic = Sound
SONAR
Missile
Hunt for Red October
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Sonoluminescence
Hydro - Liquid
Sonic - Sound Waves
Liquid Intense Sound Waves > SuperCavitaion > Intense energy from the excited molecules produces light energy.
Sonoluminescence can occur when a sound wave of sufficient intensity induces a gaseous cavity within a liquid to collapse quickly. This cavity may take the form of a pre-existing bubble, or may be generated through a process known as cavitation. Sonoluminescence in the laboratory can be made to be stable, so that a single bubble will expand and collapse over and over again in a periodic fashion, emitting a burst of light each time it collapses. For this to occur, a standing acoustic wave is set up within a liquid, and the bubble will sit at a pressure anti-node of the standing wave. The frequencies of resonance depend on the shape and size of the container in which the bubble is contained.
https://www.youtube.com/watch?v=O9B3vzsZsr4