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The largest hole in the world that I know about is a diamond mine in Russia. I can not see how that would have much effect on aircraft. Is there another hole that you know about? Thanks for comments. Joe L. Ogan
Speaking from experience as a pilot, one tends to get more updrafts and downdrafts around the mountains. Thanks for comments. Joe L. Ogan
Locally the Kimberly hole is off limits for all aircraft as there are good chances that the noise and vibration from an aircraft near it can cause rockfalls.