Is there any difference between "into" and "to the inside of" in this particular context? I understand that "into" and "to the inside of" don't have the same meaning in all contexts, but I was wondering if they did in certain context. I found that "into" and "to" can be used to indicate the destination of the action "migrate", but I am wondering when I can use "into" and if it's synonymous to "to the inside of". If not, how are they different?
For example:
He migrated into the cave on the hill.
He migrated to the inside of the cave on the hill.