Seymour Narrows and the mighty blast

Around noon on April 5, 1958, the plunger was pushed and the underwater rock that had bedeviled mariners and sunk ships large and small for centuries disappeared after almost 3 million pounds of dynamite exploded in the largest manmade non-nuclear explosion in history. (Campbell River Museum photo) It was the culmination of years of work.
Ripple Rock had lurked just underwater, right in the middle of the channel. Seymour was one of those places where the tide ran so hard - up to 17 mph - that the rock created whirlpools large enough so suck down good sized ships! Even ships attempting to transit the Narrows at the brief interval of slack water (at the top or bottom of the tide)