![](/static/253f0d9b/assets/icons/icon-96x96.png)
![](https://infosec.pub/pictrs/image/5a6528bc-c9a8-41ad-9bf5-a10f46634907.jpeg)
From the paper.
Ultrasounds accelerate extraction processes due to acoustic cavitation [8], [9]. When acoustic bubbles, also called inertial bubbles, collapse near solid materials, such as coffee grounds, they generate micro-jets with the force to fracture the cell walls of plant tissues, intensifying the extraction of the intracellular content [10].
Seems more involved than just aggressive stirring.
https://www.sciencedirect.com/science/article/pii/S1350417724001330
Plot is similar to The Beekeeper, if Jason Statham hasn’t been around to help.