How did it get there?

Today, when sawing an ordinary oak log, we came across something that you would not expect to see at all in the center of the log.How did it get there?
A shocking find in an oak tree https://youtu.be/6Zqs1lnOYxw
Surprise in the oak https://youtu.be/BR2zYT9P-oU
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Видео How did it get there? канала Belko Wood