What is the method of containment that involves placing a device over a breach to keep hazardous materials from leaking?

The method of containment that focuses specifically on placing a device over a breach to prevent hazardous materials from leaking is known as patching. Patching involves using materials or specialized equipment to seal or cover a leak, thereby stopping the hazardous substance from escaping further into the environment. This technique is commonly used in emergencies where quick action is crucial to protect public health and safety.

In contrast, diversion refers to redirecting hazardous materials away from certain areas to mitigate the potential impact. Containment generally refers to a broader strategy that includes various methods, not just sealing breaches. Regulation pertains to the rules governing the handling and disposal of hazardous materials but does not specifically address the physical act of stopping leaks. Therefore, patching is the most accurate term for the action of directly placing a device over a breach to halt the escape of hazardous substances.