The families of 96 people killed in the disaster will see thousands of official documents for the first time today.
The Hillsborough Independent Panel has been overseeing the release of previously unpublished papers from around 80 organisations including the government, police, emergency services, Sheffield City Council and the South Yorkshire coroner.
The families of the 96 football fans who died are the first to see more than 400,000 pages from 8am.
Later, Prime Minister David Cameron will address MPs in the House of Commons and the documents will be uploaded to a website for viewing by the general public.