In recent years several people have fallen to their deaths, such is the nature of the steep and unforgiving terrain.
Hamill is not the only Star Wars actor to suffer misfortune on the set of the massively anticipated films - the first of which is due to be released in December.
In June last year Harrison Ford was airlifted to hospital after the Millennium Falcon spaceship crushed his ankle and broke his leg in an accident on the set.
Crew members hastily pulled him out from underneath the prop and he was stretchered off set and flown to hospital.
The incident, at the start of an evening shoot in Pinewood Studios, Buckinghamshire, last night, came just days after fans learned the Millennium Falcon ship - piloted by Ford's character Han Solo - would appear in the new film.
Reprising his buccaneering role from the early films for Star Wars: Episode VII, it is believed Ford was about to start a scene involving space ship.
Production was halted for eight weeks while Ford recovered from surgery, which fixed his shattered limb with metal plates.
The cast and crew continued to shoot scenes in the UK without Ford's presence.
- Daily Mail