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2/6/19-- CONCORD-- Mass. State Police Sgt. Tony Vorias surfaces in the middle of Walden Pond Wednesday.  The State Police Underwater Recovery Unit was conducting ice dive training. The ice was six inches thick.   [Daily News and Wicked Local Staff Photo/Art Illman]

2/6/19-- CONCORD-- Mass. State Police Sgt. Tony Vorias surfaces in the middle of Walden Pond Wednesday. The State Police Underwater Recovery Unit was conducting ice dive training. The ice was six inches thick. [Daily News and Wicked Local Staff Photo/Art Illman]