Norwegian vessel SS Imo no relation ship collision
On the morning of 6 December 1917, the French cargo ship  SS Mont-Blanc collided with the Norwegian vessel SS Imo in the waters of Halifax, Nova Scotia, Canada. The Mont-Blanc, laden with high explosives, caught fire and exploded, devastating the Richmond district of Halifax. At least 1,782 people were killed, largely in Halifax and Dartmouth, 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 the Mont-Blanc, the impact damaged benzol barrels stored on deck, leaking 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, the Mont-Blanc exploded.
Nearly all structures within an 800-metre (half-mile) radius, including the community of Richmond, were obliterated. A pressure wave snapped trees, bent iron rails, demolished buildings, grounded vessels (including Imo, which was washed ashore by the ensuing tsunami), and scattered fragments of Mont-Blanc for kilometres. Across the harbour, in Dartmouth, there was also widespread damage. A tsunami created by the blast wiped out the community of the Mi'kmaq First Nation who had lived in the Tufts Cove area for generations.
Relief efforts began almost immediately, and hospitals quickly became full. Rescue trains began arriving the day of the explosion from across Nova Scotia and New Brunswick while other trains from central Canada and the Northeastern United States were impeded by blizzards. Construction of temporary shelters to house the many people left homeless began soon after the disaster. The initial judicial inquiry found Mont-Blanc to have been responsible for the disaster, but a later appeal determined that both vessels were to blame. The North End of Halifax has several memorials to the victims of the explosion.Investigation
Many people in Halifax first thought the explosion to be the result of a German attack. The Halifax Herald continued to propagate this belief for some time, reporting, for example, that Germans had mocked victims of the explosion. While John Johansen, the Norwegian helmsman of Imo, was being treated for serious injuries sustained during the explosion, it was reported to the military police that he had been behaving suspiciously. Johansen was arrested on suspicions of being a German spy when a search turned up a letter on his person, supposedly written in German. It turned out that the letter was actually written in Norwegian. Immediately following the explosion, most of the German survivors in Halifax had been rounded up and imprisoned. Eventually the fear dissipated as the real cause of the explosion became known, although rumours of German involvement persisted.A judicial inquiry known as the Wreck Commissioner's Inquiry was formed to investigate the causes of the collision. Proceedings began at the Halifax Court House on 13 December 1917, presided over by Justice Arthur Drysdale. The inquiry's report of 4 February 1918 blamed Mont-Blanc's captain, Aimé Le Médec, the ship's pilot, Francis Mackey, and Commander F. Evan Wyatt, the Royal Canadian Navy's chief examining officer in charge of the harbour, gates and anti-submarine defences, for causing the collision. Drysdale agreed with Dominion Wreck Commissioner L. A. Demers' opinion that "it was the Mont-Blanc's responsibility alone to ensure that she avoided a collision at all costs" given her cargo; he was likely influenced by local opinion, which was strongly anti-French, as well as by the "street fighter" style of argumentation used by Imo lawyer Charles Burchell. According to Crown counsel W. A. Henry, this was "a great surprise to most people", who had expected the Imo to be blamed for being on the wrong side of the channel. All three men were charged with manslaughter and criminal negligence at a preliminary hearing heard by Stipendiary Magistrate Richard A. McLeod, and bound over for trial. A Nova Scotia Supreme Court justice, Benjamin Russell, found there was no evidence to support these charges. Mackey was discharged on a writ of habeas corpus and the charges dropped. Because the pilot and the captain were arrested on the same warrant, the charges against Le Médec were also dismissed. On 17 April 1918, a jury acquitted Wyatt in a trial that lasted less than a day.Drysdale oversaw the first civil litigation trial, in which the owners of the two ships sought damages from each other. His decision (27 April 1918) found Mont-Blanc entirely at fault. Subsequent appeals to the Supreme Court of Canada (19 May 1919), and the Judicial Committee of the Privy Council in London (22 March 1920), determined Mont-Blanc and Imo were equally to blame for navigational errors that led to the collision. No party was ever convicted for any crime or otherwise successfully prosecuted for any actions that precipitated the disaster.
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