The Siduhe Grand Bridge spans a gorge that’s deeper than the Empire State Building is high; it’s far and away the tallest bridge ever built. Faced with the problem of how to construct it, Chinese engineers settled on a novel solution: rockets.
The engineers tethered military rockets to thick metal cables and fired them across a ravine, where the cables were set in concrete. (Other bridge builders have relied on boats and helicopters — the construction of the Niagara Falls suspension bridge involved the use of kites — but the sheer size of this gorge, and the heaviness of the cables, called for more extreme measures.) Workers are currently assembling the bridge from both sides simultaneously, and the final, center piece is due for completion early next year.
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