From the GWO website:

The aim of this module is to enable the participants to perform rescue operations, in a WTG hub, spinner and inside the blade by using industry standard rescue equipment, methods and techniques, exceeding those of GWO Working at Height.

The Hub Rescue Module shall ensure that the participants are able to:

• Take responsibility to determine rescue and evacuation strategy, performing rescue operations in a WTG hub, spinner and inside the blade (Knowledge, intermediate level).
• Explain the concepts of lifting angle, angle factor and deviation considering common risks of hazardous energies and common hazards (Ability, intermediate level).