On the morning of 6 December 1917, the French cargo ship SS Mont-Blanc was hit by the Norwegian vessel SS Imo in the harbour of Halifax, Nova Scotia, Canada. Mont-Blanc, laden with high explosives, caught fire and detonated, devastating the Richmond district of Halifax. At least 1,782 people, largely in Halifax and Dartmouth, were killed by the blast, debris, fires, or collapsed buildings, and an estimated 9,000 others were injured. The blast was the largest human-made explosion at the time. It released the equivalent energy of roughly 2.9 kilotons of TNT (12 TJ).
Mont-Blanc was under orders from the French government to carry her cargo from New York City via Halifax to Bordeaux, France. At roughly 8:45 am, she collided at low speed, approximately one knot (1.2 mph or 1.9 km/h), with the unladen Imo, chartered by the Commission for Relief in Belgium to pick up a cargo of relief supplies in New York. On Mont-Blanc, the impact damaged benzol barrels stored on deck, causing them to leak vapours which were ignited by sparks from the collision, setting off a fire on board that quickly grew out of control. Approximately 20 minutes later at 9:04:35 am, Mont-Blanc exploded.
