[Allon]

If you lined 3 or 4 of these in sequence, 30 seconds apart, wouldn’t that just keep digging the hole deeper until it was sufficient?

[rawhide]

I was thinking the same.

[unkus]

If you lined 3 or 4 of these in sequence, 30 seconds apart, wouldn’t that just keep digging the hole deeper until it was sufficient?

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I think you’re right. The Soviets had planned to do just that, but with nukes, on Cheyenne Mountain, CO, NORAD HQ. I think it’s called “Hammering”.

Someone will correct me, I’m sure.

[John S Mosby]

Right thinking is rewarded. You are correct. Also available, should the target designation be accurate, might be the old "skip bomb" technique or better yet a cruise missile of a high explosive conventional nature.

We of course have non-conventional cruise missiles that are also flyable into tunnel openings.

[DuncanWaring]

I heard that idea several years ago, but it involved spacing them closely enough that the follow-on bomb hit while the rubble from its predecesor was still in the air.

[PGR88]

If you lined 3 or 4 of these in sequence, 30 seconds apart, wouldn’t that just keep digging the hole deeper until it was sufficient?

That's what I thought. Keep it up for a few days. If nothing else, it would bury their plant under a mound a rubble that would need months to excavate.