After you discover a fire, the first thing you should do is start fighting the fire. start the sprinkler system. call for back-up. activate the fire alarm.

activate the fire alarm.<br /><br />The first thing you should do after discovering a fire is to activate the fire alarm. This alerts everyone in the building to evacuate and notifies emergency services of the situation. Once the alarm is activated, you can then proceed with other actions such as calling for back-up or using a fire extinguisher if it is safe to do so.