Scientists at Israel’s Technion Institute have generated a sonic black hole – a system from which sound waves cannot escape. Its purpose was to emulate a true black hole from which light cannot escape. It even emits Hawking radiation, as predicted by the scientist Professor Stephen Hawking over 50 years ago.
https://www.technion.ac.il/en/2021/02/hawking-radiation-and-the-sonic-black-hole/