I'm not a physics major but cavitation is pretty interesting nonetheless.

https://physics.stackexchange.com/questions/21598/is-there-more-energy-in-the-collapse-of-a-cavitation-bubble-than-the-energy-requ

Even more interesting is cavitation bubble collapse in saltwater. The collapse causes coulombic explosions as the pressure crushes sodium and potassium ions in the saltwater. If you put 1 energy unit in to create the cavitation, you can get 18 units back.

https://pdfs.semanticscholar.org/4c17/9bb62e643957a01497672647f7804859e1a6.pdf

The main emphasis is on the ability of cavitation to produce additional energy to produce free heat energy, as well as radiation-nuclear energy. Moreover, this thermal energy is not destructive, but useful.

https://www.achrnews.com/articles/130064-patent-filed-for-invention-that-makes-steam-using-cavitation

“Cavitation Engine,” that the company said describes the first commercially viable system capable of harnessing the power of cavitation to produce energy at a fraction of the cost of using conventional technology. The Cavitation Engine incorporates CES proprietary impact chamber design in a scalable steam generation system which generates superheat steam for less energy than fossil-fueled boilers.

Cavitation, the process of vaporization, bubble generation, and bubble implosion in a flowing liquid, is used as the underlying process within the Cavitation Engine. The engine uses mechanical energy to convert water into steam via the process of cavitation and subsequent bubble collapse. Modified automotive fuel injectors are used to accelerate water saturated with cavitation nano-bubbles at a specially designed impact target. During the collision, enormous hydraulic pressures collapse the bubbles within the injection volume. These vapor bubbles have the ability to focus intense energy. The resulting heat contributes to the creation of superheat steam.