What’s the quietest thing you’ve ever heard in a hospital?

Not the beeping—those are loud. But the hush right after a code is called, when everyone freezes for half a second before moving. Or the way a patient’s breath sounds when they’re so tired they don’t even know they’re breathing anymore. I keep thinking about how silence in ICU isn’t absence. It’s a kind of presence. What’s the quietest thing you’ve ever noticed in a place like that?