In the 1980s, a series of small excavations were carried out by English Heritage mainly to clear debris from the passage to aid examination and repair work after routine ploughing of the field, when the blade of the plough breached the roof of the main chamber: this hole has since been turned into an entrance stairway for visitors.
In the 1980s, English Heritage conducted a series of small excavations to clear debris from the passage, which was done to facilitate examination and repair work after routine plowing of the field. The plow blade broke through the roof of the main chamber, creating an entrance stairway for visitors.