Everlasting Summer: Loner

What will happen to a person locked in one place for five years? And ten? Let's focus on the psychological side of the issue.
Will he go deep into himself, become a madman, or will he seek solace in self-development? Will he have bouts of apathy or outbursts of rage?
And if Semyon spends even more years there? Let's say... a thousand?
Why is he locked up in his solitary cell? Why is he still alone? How is the Owl arranged? And how ... how not to go completely crazy?