An industry in its own right! Rescue provision is required for any working at height task and so adequate equipment and competence is required. However, the techniques used in each situation vary the world over and there are only a few fundamental similarities. Often ropes and rescue harnesses are employed to give lightweight and versatile approaches to rescue, however, rescue tripods, stretchers, edge management techniques, etc may be required if the situation is more complex.
Techniques required for a low angle cliff face rescue in Arizona using many rescuers with winches, rollers, etc are almost polar opposite to a confined space rescue situation on an offshore windfarm for example, yet raising, lowering and management of the casualty (or casualties) as a load is required in both situations.