The audio begins with the pilot's voice, as he says: "30024... passed to the northwest... We observed something approximately 30 feet tall. Not sure what it is. At about 6,500 to 6,800 feet." Incredulity can be heard in the voice of the official replying to him: "You said it was 30 feet tall?" "It was pretty tall, probably about 30 feet tall. It was going opposite direction of us," the pilot says. "NO25, was it moving at a fast pace?" the controller replies. "It was moving away, affirmative, for 30024," says the pilot.