In naval terminology, what might the term "Lifeline" mean?

In naval terminology, "Lifeline" refers to the protective barriers on ships, which serve a critical safety function. These lifelines are typically rope or wire cables that are secured around the perimeter of a ship's deck and act as a safeguard to prevent personnel from falling overboard. They provide a physical barrier that enhances the safety of crew members when working on deck, especially during rough sea conditions or when undertaking repairs and maintenance activities.

These lifelines are essential for maintaining safety while ensuring that crew members can move about the vessel without the risk of accidents. This term is integral to shipboard safety practices and is vital for operational readiness, particularly on warships and other naval vessels.