What is a small diameter cord used for highlines that is thrown or shot across a span called?

The term for a small diameter cord that is used for highlines and is typically thrown or shot across a span is referred to as a messenger line. This type of line serves a crucial role in technical rescue operations by enabling the establishment of communication or support lines across distances where it would be difficult or impractical to send larger, more robust lines directly.

Messenger lines are often lightweight and easily maneuverable, which makes them ideal for getting a line across obstacles such as rivers, canyons, or building spans. Once the messenger line is in place, a larger, more capable line can be pulled across using it, facilitating a variety of rescue scenarios.

Understanding the function and terminology surrounding messenger lines is essential for effectively implementing highline systems in rescue operations, enhancing both safety and efficiency in these challenging environments.