I used to ride BART 4-5 days a week, through the Transbay tunnel. I frequently got the "sustained loud noise" warning from my watch, notifying me that the combi

I used to ride BART 4-5 days a week, through the Transbay tunnel. I frequently got the "sustained loud noise" warning from my watch, notifying me that the combined duration and intensity of the ambient sound was enough to damage one's hearing.