Collection search - A planned explosion in Vancouver

Title based on the following caption from the NFB Photo Story: On April 5 at 31 minutes past 9 on a misty grey morning a mighty explosion whipped the foam-flecked waters of Vancouver's Seymour Narrows into a 1,500 foot fountain tossing huge boulders into the air like pebbles and destroying forever the age-old navigational hazard of twin-peaked Ripple Rock, graveyard of a hundred ships and the men who went down with them. The blast was the spectacular end of a bold enterprise which was 5 years in the planning and preparation; as the boiling waters slowly settled back, the destruction of Ripple Rock took its place as one of the great engineering feats of our time.