Halifax Explosion

The Halifax Explosion occurred on Thursday, December 6, 1917, when the city of Halifax, Nova Scotia, Canada, was devastated by the detonation of the SS Mont-Blanc, a French cargo ship that was fully loaded with wartime explosives. The Mont-Blanc detonated after colliding with the Norwegian SS Imo in a part of Halifax Harbour called "The Narrows". About 2,000 people were killed by debris, fires, and collapsed buildings, and it is estimated that around 9,000 were injured. Until the Trinity test explosions of atomic bombs, it was the largest man-made explosion in recorded history.

At 8:40 in the morning, the SS Mont-Blanc, chartered by the French government to carry munitions to Europe, collided with the unloaded Norwegian ship Imo, chartered by the Commission for Relief in Belgium to carry relief supplies. Mont-Blanc caught fire ten minutes after the collision and exploded about twenty-five minutes later (at 9:04:35 AM). All buildings and structures covering nearly 2 square kilometres (500 acres) along the adjacent shore were obliterated, including those in the neighbouring communities of Richmond and Dartmouth. The explosion caused a tsunami in the harbour and a pressure wave of air that snapped trees, bent iron rails, demolished buildings, grounded vessels, and carried fragments of the Mont-Blanc for kilometres.