Most likely Halon, for which there are huge exaggerations re how quickly it kills humans. Sucks up the oxygen etc was one of the classics. Sure you need to get out but more for the toxic shite that gets released by the fire. Is doesn't kill the fire by oxygen removal.
My old company had vast clean agent fire suppression systems throughout many electric rooms containing a lot of electronics including computers and drive systems. All protected by Halon deluge systems.
Air NZ and my old company were the only ones in NZ that had dispensation to continue using Halon beyond the prohibited date. I think now the old joint may have changed to HFC-227ea in recent years.
Unfortunately, Halon was/is one of the most effective fire suppressants around with mostly minimal damage to electronic equipment it protects. It is one of those gases that mangles the ozone layer, or so I am told.
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