As it happens, many years ago I worked for Amazon and encountered a small microwave fire in the break room. I dealt with it myself, but I realized I had no idea what the appropriate way to notify somebody about a fire. I inquired and discovered that in the event of a fire, the correct behavior would have been to return to my desk and file a Sev-2 incident with the Facilities team. This should in theory page someone who could respond to the building being on fire. I asked if they meant Sev-1, but they said Sev-1 would be reserved for a fire that was impacting website traffic.