The Halifax Explosion occurred on 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". Until the Trinity test explosions of atomic bombs, it was the largest man-made explosion in recorded history.
The SS Mont-Blanc. On Thursday morning, 6 December 1917, she entered Halifax Harbour in Nova Scotia, Canada laden with a full cargo of highly volatile explosives and was involved in a collision with the Norwegian ship, SS Imo. A fire aboard the French ship fire ignited her cargo of wet and dry picric acid, TNT and guncotton. The resultant Halifax Explosion levelled the Richmond District and killed approximately 2000 people.