How windy is it?
It sounds like a jumbo jet is going to land on the roof of the subway ceiling.
All along the tracks are big vent shafts to exhange air with the outside. When the wind blows over them, is creates a really low rumble sound. I’ve never heard it before today.
You can tell it is the wind because little leaves and small debris fall through the holes like snow everytime the wind blows or a train goes by.
This must be mildly similar to what a tornado sounds like.
Live from the subway, back to you in studio…