How to turn sound into light, how does the sound and light phenomenon produce? No one in the world yet knows

Recently, Vsauce, Minutephysics, ASAP and a total of 10 YouTube popular Popular Science video producers joint alltime10s column produced a "Science Ten Unsolved Mysteries", this period minutephysics is one of them ...

What is the sound and light phenomenon? That's what the wiki explains:

Sonoluminescence is a phenomenon in which bubbles explode (implosion) and burst into a very brief light when the bubbles in the liquid are stimulated by sound. Frenzel and H. Schultes of the University of Cologne were the first to observe sound luminescence in 1934 when they studied sonar. During the course of the experiment, the two people wanted to speed up the process of photo development, put an ultrasonic transducer into the tank filled with the reagent, and then observed some small bright spots on the negative after the development.

So, how is the sound and light phenomenon produced? Unfortunately, Xiao-bian can't give you a definitive explanation. There are three or four explanations in the video below, but which one is the real cause? No one in the world knows yet.