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See Gnome Cavity:
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Most similar to the proposed Yorkshire detonation was Project Ketch, a proposed 24 kiloton underground detonation in central Pennsylvania intended to create an subterranean storage cavity for natural gas with a capacity of 465 million cubic feet. The test was scheduled for 1967, but as Project Plowshare wound down, was not pursued. Pennsylvania Geology published a 50 year retrospective on the project in 2017, “The Half-Century Anniversary of Project Ketch” [PDF].
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