What is the first thing to be done on the surface in the event of an explosion?

In the event of an explosion, ensuring that the ventilation fan is working properly is crucial for several reasons. Ventilation systems play a vital role in clearing harmful gases or smoke that may accumulate due to the explosion, allowing for safer conditions for responders and anyone still in the area. Proper ventilation helps to prevent the buildup of toxic fumes and reduces the risk of secondary explosions, enabling a clearer environment for recovery operations and for assessing the situation.

While it is essential to consider evacuating the area, alerting emergency services, and eventually starting recovery operations, the immediate safety of those potentially still in the vicinity hinges on ensuring that air quality is addressed first. Effective ventilation can facilitate a safer response by providing breathable air for rescue teams and minimizing risks to survivors.