On June 23, 1985 an Air India flight enroute from Montreal to Mumbai exploded off the coast of Ireland, killing all 329 people aboard. Except this was no accident. A bomb had been placed in luggage by Sikh terrorists living in Canada. This was the single greatest act of aviation history prior to 9/11. What ever happened to Sikh terrorism? Borealis explores this issue with veteran CBC reporter Terry Milewski.