So I was playing spike rush this morning on Haven and during the buy phase there was a weird whispering noise in one of the walls, I know it was in the game cuz I took off my headphones and there was nothing, put them back on and there it was! It went away when the round started, and one of my teammates heard it as well. Anyone know what it could be?

It was on defender side, the wall after the hall leading to A site and across from the hallway leading to mid. I have a picture attached.