What is the worst disaster in Canada history?

The worst disaster in Canadian history is often considered the Halifax Explosion of December 6, 1917. A massive explosion occurred in the harbor of Halifax, Nova Scotia, when the French cargo ship SS Mont-Blanc, loaded with munitions, caught fire and detonated. The blast killed approximately 2,000 people, injured around 9,000 others, and devastated the surrounding area, making it one of the largest non-nuclear explosions in history. The disaster had significant social and economic impacts on the region and led to changes in safety regulations for handling explosives.