Technical rescue teams respond when the situation is especially difficult and requires significant resources to be deployed. Examples might be a vehicle roll-over off a cliff or into a ravine. Evacuation of an injured worker from a location that is difficult to access. Helicopter rescue operations in mountain terrain.
Technical rescue teams operate in any terrain. They have complete mastery of all progression and belay techniques on a rope. When the terrain allows, downward evacuation is preferred because of the gravity -assist. Upward evacuation is a team effort that requires perfect coordination by everyone involved. It demands techniques which are sometimes particularly complex – Raising systems, creating a hauling system using lightweight pulleys, counterweight techniques, or elaborate systems using high directions.