I spoke with two others who heard the boom, as well. One heard it from a couple miles away from me.
We’re overlooking the North Shore of Oahu and there are a lot of military activities in the area – and, occasionally, pig hunters with shotguns. I don’t think it was either of these, considering the circumstance.
This was a single boom and there was nothing accompanying it to help me identify the source. A month, or so, earlier, I heard similar boom.
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