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The original was posted on /r/todayilearned by /u/oceanicplatform on 2025-06-24 21:09:29+00:00.

Original Title: TIL deep penetrating “earthquake bombs”, made of almost 50% high-tensile steel, were invented by Barnes Wallis, the British inventor of the bouncing bomb used by the Dambusters in WW2. The 22,000lb / 10,000kg Grand Slam was the largest non-nuclear bomb used in WW2.