Well, either you like to Ignore my warning, or you are not aware off how you come across.
Either way you will end up in Prison for 24 hours and become guilty.
First of all: The tunnel does not belong to you, even if you build it. And you can’t expect anyone to know that. If you want it to belong to you, build a base and everyone knows.
Second: You know we have all the chat available, or? You straight out lied about what you/he said. And your behavior was not ok.
Third: Digging under his base is griefing. Getting stuck under it is no excuse. There are even commands available to you to to fix that without digging.