https://www.keranews.org/health-science-tech/2014-09-12/on-t...
Also, a quibble, it's Halon not Argon. Nobody sprays water around a room full of burning electrical equipment.
Halon is no longer being manufactured for greenhouse reasons (afaik.) Alternatives being worked on: https://www.firetrace.com/fire-protection-blog/why-is-halon-...