The audio starts with a mellow, consistent hum, the sound one typically associates with electricity. It is the soft, almost soothing drone of a generator working behind the scenes to keep everything running smoothly. As the audio progresses, the hum seems to grow in volume, encapsulating the listener, just like the cool embrace of a walk-in fridge. There is a sense of buzzing, a quiet undercurrent to the hum, that adds another layer of depth to the audio. It's not a harsh or intrusive buzz but rather a gentle reminder of the fridge's constant operation. This audio perfectly encapsulates the experience of standing inside a bustling walk-in refrigerator, surrounded by the gentle hum and buzz of the cooling unit at work.