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The Ingenious Ancient Technology Concealed in the Shallows

Stream or download audio For this article This article is also available in audio format. Listen now, download, or subscribe to “Hakai Magazine Audio Edition” through your favorite podcast app. Article body copy It was a cool spring morning on British Columbia’s Vancouver Island when the ground began to buckle and heave. On the Richter scale, the earthquake reached a magnitude of 7.3 at a place called Forbidden Plateau. Seventy-five years later, it still holds the title as the most powerful onshore quake ever recorded in Canada. In nearby communities, brick walls fell and three-quarters of all chimneys collapsed. Two casualties were recorded that day: one man died of heart failure and another drowned after his dinghy was overturned by a wave generated when a piece of land gave way and thundered into the sea. For a while, that seemed like the end of the story. But over time, the changes wrought by the quake revealed a mystery that had lain hidden for generations long enough t

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