What is a tether line in the context of wreck diving?

A tether line in wreck diving is primarily recognized as a navigational tool that aids divers in environments with poor visibility. When exploring wrecks, visibility can often be compromised due to silt, debris, or other factors. The tether line allows divers to maintain a connection to a known point, such as a buddy or the entry point, ensuring that they can navigate safely without losing their way.

This line provides a reliable means of orientation, enabling divers to explore the wreck while having the ability to return to safety easily. The use of a tether helps in mitigating the risks associated with disorientation, making it easier for divers to remember their route back, especially in complex wreck environments where passageways can become confusing.

While there are various equipment and techniques used in wreck diving—such as safety devices for emergencies or tools to connect divers—these do not encapsulate the primary function of a tether line as effectively as its role in navigation.