The revelations that began in that ambulance ride on Feb 17 cracked wide one of the most shocking secrets to ever tarnish Waterbury, a small, former manufacturing city in the southern part of Connecticut. The police now believe what the man said in the ambulance that evening: For the past 20 yrs, an 8X9’ room on the top floor of a disheveled house at 2 Blake Street was a prison cell for a boy — now a man — last been seen by the outside world when he was in the 4th grade.