What is the best method for securing a rescue line?

Using a figure-eight knot or a bowline knot for securing a rescue line is considered the best method due to their reliability and strength. The figure-eight knot is easy to tie and untie, even after bearing a heavy load, making it ideal for rescue scenarios where time and safety are critical. It also has the advantage of providing a clear visual representation of the knot's integrity, which is essential in high-stress situations.

The bowline knot, on the other hand, creates a fixed loop at the end of the line, which does not slip or bind under strain, making it excellent for attaching the line to a harness or anchor point. This characteristic ensures that rescuers can depend on the knot to hold secure under the forces encountered in water rescue operations.

Together, these knots provide a robust and trusted connection that can withstand the dynamics of swiftwater environments, where the forces exerting on a rescue line can be unpredictable and significant. This reliability is critical for ensuring the safety of both the rescuer and the victim being assisted.