What is a pre-tensioned tieback used for in rescue operations?

A pre-tensioned tieback is utilized in rescue operations primarily to create tension in the rope or web that connects anchor points. By establishing tension between the anchors, the system can help prevent excessive movement or slippage of the anchors, which is crucial for maintaining stability during a rescue scenario. This allows rescuers to effectively manage the load dynamics on their equipment and ensure safety while performing operations.

In rescue contexts, having a tensioned tieback is essential for maintaining control and reducing the risk of anchor failure when weight is applied, such as when a rescue load is being lifted or lowered. This tensioning capability is especially important in confined space rescues where space is limited, and precise control over equipment and movements is necessary.

The other options do not address the primary function of a pre-tensioned tieback. For example, connecting two anchors with minimal load does not capture the intent of providing stability and safety through tension. Supporting the entire load during a rescue is not accurate as the load is distributed across a system of anchors, and untie knots while under load is not relevant to the purpose of a pre-tensioned tieback which is to secure the anchors rather than manipulate knots.