19 Jul 12PetawawaCovering a military parachuting exercise in the north end of the training area at CFB Petawawa I observed something that I have never seen before.Directly above the Chaulk River Nuclear Facility at approx 1-2km away were two symetrical vertical spyralling contrails. They began at approx 5000ft and ended at approx 8000ft. They were very sharp and spyralled like a DNA strand. They did not move and did not evaporate for approx 1 hr.2 other witnesses present. Not sure if they want to be known.Although this is not a UFO, It may give weight or evidence to sighting dated 2 Aug 12. It may give weight or evidence or disclosure to projects at Chaulk River Nuclear Facility