fn main() {
    let deep_wrapped: Option<Option<Option<String>>> = Some(Some(Some("hello".to_string())));

    let unwrapped1 = deep_wrapped.expect("None in depth 1!");
    let unwrapped2 = unwrapped1.expect("None in depth 2!");
    let unwrapped3 = unwrapped2.expect("None in depth 3!");

    println!("{}", unwrapped3);
}