This document outlines procedures for responding to a MAYDAY situation and provides guidance on properly declaring a MAYDAY as well as nine self-survival steps firefighters should follow if lost, trapped, or in distress. It details when and how to declare a MAYDAY using the LUNAR method of communicating location, unit, name, air supply status, and resources needed. The document also lists self-survival techniques firefighters should implement after calling a MAYDAY, including checking air gauge, using radio, activating personal alert safety system device, conserving air, staying low, making noise, and exiting or shielding airway.