A summer remodeling project at the Hibbing High School offered an unexpected look back to the world in 1973 - when workers uncovered letters hidden behind a blackboard.

According to the Hibbing Daily Tribune, the letters were written by Mike Torrel's Math students when that chalkboard was being installed.  The instructors had an impulse that the students should write messages and leave messages for the future - to be hidden in the wall behind the blackboard.  Those letters finally saw the light of day again this summer when workers removed the fixture from the wall.

The void behind the chalkboard included twenty-two letters that were stuffed into an envelope along with some names and messages signed on the wall.  The students involved were in 9th grade at the time.

Officials with Hibbing High School have no immediate plans for the letters but are considering adding them to a memorial cabinet in one of the hallways.