Define "inflatable dam" in damage control.

An inflatable dam is a device specifically designed to temporarily prevent or control water ingress, making it essential in damage control situations. It is typically deployed in scenarios where water is entering a space, such as during flooding or in the case of a hull breach on a maritime vessel. The inflatable nature allows it to be quickly set up and deployed as a flexible barrier, expanding to create a temporary seal against incoming water. This effectiveness helps mitigate damage and buy time for more permanent repairs to be conducted.

The other options do not capture the primary function of inflatable dams. A permanent structure for water containment would suggest a fixed installation, which does not align with the temporary nature of inflatable dams. Tools for firefighting are designed for a different purpose altogether, focusing on extinguishing fires rather than controlling water ingress. Finally, sealing doors refers to a specific action rather than a device, which takes away from the unique capabilities that inflatable dams provide in damage control scenarios.