It was russia, soviet russia, the russians had a case of 13 guys killing themselves in one office in under 21 years, turns out it was a preindustrial building later modified with central heating and air and this room had a custom vent work that rattled and rumbled with almost precisely the same frequency as a tiger growl, they then copied the design and used it for many of the soviet "republics" western embassies. Of course cuba had the tech.