At 10:31 p.m. on Sept. 2, 1998, Nova Scotians felt their homes shake as Swissair flight 111 slammed into the waters off Peggy's Cove, killing all on board. There were 229 passengers and crew, including a Saudi Prince and a relative of the late Shah of Iran. In the cargo hold, a half a billion dollars worth of gold, diamonds and cash.

Early into the crash investigation, the Transportation Safety Board (TSB) of Canada made a preliminary finding that the tragedy was the result of an accident. The TSB would ultimately point to a fire in the cockpit, likely sparked by an electrical fault. But there remained many unanswered questions and mysteries.

Years later, the crash remains one of Canada's greatest tragedies. Now new disturbing information from one of the crash investigators raises chilling questions about the official cause of the disaster.