What does a dead turbo sound like?

I'm curious, can you describe what a dead turbocharger sounds like? I've heard some strange noises coming from my car's engine lately, and I'm wondering if it could be related to the turbo. Is it a high-pitched whine, a deep rattling, or some other type of sound? I'm trying to diagnose the issue before taking it to a mechanic, so any details you can provide would be greatly appreciated. I'm especially interested in knowing if there are any characteristic sounds that are typically associated with a failed turbocharger.