Which knot is best for attaching a lifeline to a fixed attachment point?

The figure 8 knot with a follow-through is considered the best choice for attaching a lifeline to a fixed attachment point due to its strength and security. This knot creates a secure loop that is easy to inspect and is less likely to slip under load, making it reliable for safety applications such as climbing or rescue operations.

When tied correctly, the figure 8 with a follow-through is highly resistant to untying under load, which is crucial for maintaining safety in situations where a lifeline is involved. Additionally, this knot is versatile and can be easily adjusted, allowing for quick modifications when needed. Its structure allows for a clear visual confirmation of having been tied correctly, enhancing safety by reducing the risk of errors.

In contrast, while the bowline does provide a fixed loop, it can potentially come undone if not under constant load. The double clove hitch, although useful for fastening objects, lacks the same level of load-bearing capability and security as the figure 8 follow-through. The sheepshank is typically used for shortening a length of rope rather than securing a lifeline, making it unsuitable for this particular application. Thus, the figure 8 knot with a follow-through is the preferred option for safely attaching a lifeline.