What is the function of a Power Driven Door?

The function of a Power Driven Door is primarily to block incoming water during incidents, particularly in marine settings. These doors are designed to provide watertight integrity, preventing water from entering critical areas of the vessel during flooding or when the ship is damaged. This is essential for maintaining the ship's stability and safety, as uncontrolled water ingress can lead to capsizing or sinking.

While power driven doors may have some impact on access and airflow, their key purpose is to serve as a barrier against water intrusion, making option B the most accurate choice. This functionality is vital in emergency scenarios where managing the risks associated with water entry is paramount to ensuring the safety of personnel and the vessel itself. Other options might refer to benefits that aren't the primary purpose of such doors in the context of fire fighting and marine operations.