Nicholas Long, Commissioner of the Independent Police Complaints Commission, said Sean Price almost got away with deceiving their investigation.
He told reporters that Mr Price had lied and put pressure on a member of staff to lie on his behalf.
Mr Long said the former Chief Constable used his position to order people to do as he wished and said his standards fell far below those expected of someone in his position.
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The country's first museum dedicated to coal miners' art showcases the pitmen's desire to tell the hidden story of their lives underground.
The announcement is part of a £500 million cost-cutting drive which will take place over three years.
The force wants to raise awareness of the scale of the problem which affects areas across the UK, including the north east.