The Knoxville News-Sentinel has a piece on the one-year mark of the Y-12 break-in here. Professor Hall is quoted in the article, as follows:
“The aura of impregnability is gone. Probably forever,” Howard Hall, director of the University of Tennessee’s Institute for Nuclear Security, said last week. “This might encourage others to think that similar acts of ‘aggressive dissent’ might succeed, and so we may see more of these intrusions in the future. The recent Greenpeace break-ins at nuclear plants in France might be indirectly a result of the greater daring of the perpetrators, encouraged in some part by the Y-12 ‘success.’ Likewise, if there is a violent adversary planning something, this has given them some potentially useful insights.”