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We are now going to demonstrate the use of a lifeline. Once again, as the connection should be a two-point operation, spring, as well as the twist. Lock into place. Bent back. Jim now will be leaving and going through into a confined space. I normally would be on the outside, but for demonstration purposes, I am in here. Off he goes. This means he is always permanently attached. I know where he is. But we could also use this as a means of communication. So, for example, one tug: Are you okay? Next, two tugs: More slack.

Next, three tugs: Take up slack. Next, four tugs: That means emergency. Make your way out.

So there are some situations where this is a useful piece of equipment, both a means of warning and as well as knowing exactly where somebody is within the confined space.