Large vessels have compulsory pilotage , with harbour pilots boarding at the pilot station off Chebucto Head . Vessels wishing to transit The Narrows between the outer harbour and Bedford Basin must travel one at a time ; this rule was established after the disastrous Halifax Explosion of December 6 , 1917 when a collision between the French munitions ship '' Mont-Blanc '' and the Norwegian ship '' Imo '' destroyed part of Halifax and Dartmouth
Halifax Explosion
Halifax Explosion
Halifax Harbour