We can reduce the necessity of rescue, but if the worst does happen at least you will know that you have the best in the business on your team.
For example if you have operatives working at height, on scaffolding, MEWPs or cable systems and they are using their harnesses as fall prevention.
What happens if one was to fall? If that person is suspended in their harness and is not rescued in a few minutes they will start to succumb to suspension trauma, a potentially fatal blockage of blood flow, caused by the straps of the harness. And by the time the Fire brigade find a way to get them down who knows?
Please involve our working at height team in the planning stages of any task to reduce any risk and make it safe and feasible. They can provide a system, training and a rescue back up team.