If you have a smoldering package of flammable solids, what is the one thing you should never do?

When dealing with a smoldering package of flammable solids, opening the package is the action that should always be avoided. This is because opening the package could expose its contents to air, which may intensify the fire or cause a rapid combustion of volatile substances present inside. When flammable solids are smoldering, they can release flammable vapors that could ignite suddenly, leading to a larger fire or explosion.

In contrast, calling for help is a prudent step to ensure professional assistance arrives to handle the situation safely. Extinguishing the fire with water is generally inappropriate for flammable solids, as this can cause the fire to spread or worsen. Moving the package to a safer location could also be dangerous since it may disturb the smoldering materials, potentially leading to an escalation of the fire. Thus, not opening the package is critical for maintaining safety.