Who was the train dispatcher who sent a warning message to another passenger train in the December 6, 1917 Halifax maritime disaster?
Halifax Explosion The Halifax Explosion was a maritime disaster in Halifax, Nova Scotia, Canada, on the morning of 6 December 1917.  , a French cargo ship laden with high explosives, collided with the Norwegian vessel  in the Narrows, a strait connecting the upper Halifax Harbour to Bedford Basin. A fire on board the French ship ignited her cargo, causing a large explosion that devastated the Richmond district of Halifax. Approximately 2,000 people were killed by blast, debris, fires and collapsed buildings, and an estimated 9,000 others were injured. The blast was the largest man-made explosion prior to the development of nuclear weapons, releasing the equivalent energy of roughly 2.9 kilotons of TNT.
Man overboard "Man overboard!" is an exclamation given aboard a vessel to indicate that someone (not necessarily a "man" but historically one of the crewmen "manning" the vessel) has fallen off of the ship into the water and is in need of immediate rescue. Whoever sees the person's fall is to shout, "Man overboard!" and the call is then to be reported once by every crewmember within earshot, even if they have not seen the victim fall, until everyone on deck has heard and given the same call. This ensures that all other crewmembers have been alerted to the situation and notifies the officers of the need to act immediately to save the victim. Pointing continuously at the victim may aid the helmsman in approaching the victim.