When is the Emergency Gas Supply (EGS) mandatory for the KM37?

The Emergency Gas Supply (EGS) is a critical safety feature in the KM-37 diving system, designed to provide a backup air source in case of an emergency. The requirement for having an EGS becomes particularly significant at deeper depths due to the increased risks and potential complications associated with such dives.

At depths greater than 60 feet of seawater (FSW), the physiological effects of pressure on divers increase, along with the risk of encountering a situation where a secondary air source is necessary. This can include scenarios such as equipment malfunction, unplanned ascent, or other emergencies, which necessitate the availability of an immediate air supply to ensure the diver's safety.

When diving shallower than 30 FSW or in situations like only using air, the enhanced risks associated with safety equipment requirements are not as pronounced. Similarly, while night dives can present additional hazards, the critical factor for EGS requirement is primarily focused on depth due to its correlation with increased pressure and potential for emergencies.

Thus, the condition that mandates having an EGS is deeper dives, specifically those exceeding 60 FSW, ensuring that divers have a reliable backup in more hazardous underwater environments.