What is the main function of the additional cylinders in a firefighting context?

The main function of additional cylinders in a firefighting context is to support the firefighting team with an oxygen supply. In situations where firefighters operate in environments that are hazardous or where the air quality is compromised, these cylinders provide breathable air, allowing firefighters to perform their duties safely and effectively. The use of oxygen cylinders is crucial in ensuring that firefighters can enter smoke-filled or otherwise toxic areas without facing the risk of asphyxiation or respiratory harm. This aspect of their equipment is vital for maintaining the safety and wellbeing of the personnel involved in firefighting operations.

In contrast, other options do not align with the primary purpose of these additional cylinders. Cylinders are not designed for storing water, transporting tools, or heating water; these functions are typically handled by other specialized equipment in firefighting operations.