What fires are classified as below grade fires?

Fires that are classified as below grade fires specifically refer to those that occur in areas such as basements or sub-levels of buildings. This classification is important as it indicates unique challenges in terms of accessibility, smoke migration, ventilation, and safety protocols for fire responders. Below grade fires often require specialized tactics and considerations compared to fires that occur in above-ground or outdoor settings. Understanding the dynamics involved in these scenarios is crucial for effective incident management and firefighting strategies. Therefore, the focus on basement or sub-level areas is what makes this option the correct choice.