In the 16-hour timeline of the documentary, Gunnarsson squeezes in all re-enacted important events - such as the testing of bombs by plot mastermind Talwinder Singh Parmar and Inderjit Singh Reyat, wiretapping of plot conversations and their mindless erasing by the Canadian spy agency, and baggage screening machines conking out at Toronto airport that day.

But the most moving part relates to the soon-to-be victims saying a lingering last goodbye to their loved ones and their last happy moments on the plane.

The most disturbing part is the footage of recovery operations and identification of bodies in Ireland: how twisted and taut bodies were fished out of the waters by Irish rescuers who were overwhelmed and driven to tears by the magnitude of the tragedy, how one woman identified her sister by the way she wore her eyeliner, and how a woman found only one of her two young boys.

The frequent comments by Jack Hooper, retired deputy director of the Canadian spy agency (called Canadian Security Intelligence Service or CSIS), show how Canadian agencies underestimated threats by Sikh radicals despite repeated warnings by India.

And one cannot be left untouched by the remorse of check-in assistant at Vancouver airport who let an M. Singh prevail upon her to check in the bomb-carrying suits despite non-availability of a connecting flight from Tokyo.