Assertion: earthquake bomb | /r/CapableOf | penetrate upon impact
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text: By the end of the war, planes such as the allied forces' Avro Lancaster were delivering with 50 yd (46 m) accuracy from 20,000 ft (6,100 m), ten ton earthquake bombs (also invented by Barnes Wallis) named "Grand Slam", which, unusually for the time, were delivered from high altitude in order to gain high speed, and would, upon impact, penetrate and explode deep underground ("camouflet"), causing massive caverns or craters, and affecting targets too large or difficult to be affected by other types of bomb.