This large room houses the secret training scrolls of the Cloud Village. Like the prison, it hovers in the sky, though unlike the prison this is covered in a cloaking barrier that keeps it from being sensed at all. It doesn't even admit chakra signatures past its barrier, making it almost completely undetectable. A guardian inside named Gokudera keeps possible intruders from obtaining the scrolls, and anybody who wants them must defeat him first. (I'll post his profile when somebody actually trys to get in here).