What are blow holes indicative of in fire investigations?

Blow holes are indicative of significant arcing and energy release during fire investigations. These features, typically found in materials like wood or other combustibles, are formed when an electrical current arcs through the material, generating intense localized heat. This arcing can occur due to damaged wiring, overloaded circuits, or poor connections, leading to a rapid and intense ignition. The presence of blow holes can suggest that an electrical fault was present prior to or during the fire, providing valuable clues to investigators in determining the cause of the fire. The unique features of blow holes serve as evidence of the patterns and behaviors that result from electrical energy being released in a concentrated manner.