I've often wondered how is fire safety exercised in super tall structures and skyscrapers. One obvious method is to install fire or smoke sensors connected to sprinklers. However, that'd just alert people! What about the mechanism to evacuate people in shortest possible time? In 2-5 storey building, it's possible to evacuate people through fire exits (usually stairs); but that's not an option in high-rise buildings. So, is elevator the only option?