Unexpected surprise in a 100 year old ash tree

Today, when sawing a 100 year old ash tree, we came across an unexpected surprise. Write in the comments your thoughts about what this thing is.
A shocking find in an oak tree https://youtu.be/6Zqs1lnOYxw
Surprise in the oak https://youtu.be/BR2zYT9P-oU
sawing equipment: https://www.farmertec.com/?parent_user_id=14436710&utm_source=sns_share&utm_medium=share_url
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#Shocking #woodworking #Surprise