Almost 11 years ago (March 27 2010) in Ukraine datacenter of company Hosting.ua went in flames as clients were watching their systems go unresponsive at various

Almost 11 years ago (March 27 2010) in Ukraine datacenter of company Hosting.ua went in flames as clients were watching their systems go unresponsive at various rows of the datacenter. Anti-fire systems didn't kick-in. The reason? For couple of days the system was detecting a little bit of smoke from one of the devices. Operators weren't able to pinpoint exact location, considered it a false alarm and manually switched anti-fire system off.