This happened to me on a weekend in November 2015 on a trail about a mile or so east of Lake Mille Lacs in Central Minnesota. There is a smaller lake called Anderson Lake along this trail that I have walked by many times before and after this event, but this happened only once out of the many times that I have walked by this lake. I was fifteen when this had occurred, and have always been a believer in the paranormal, but I am not sure if this event can even be classified as paranormal as a whole, but in my attempt to record it I am not so sure.
I was walking along the trail to get to a side trail not to far from where this had occurred, I was alone with my thoughts for the most part. It was clear, sunny, and cold–cold enough that the lake was frozen over with thin ice. I had gotten about a few hundred yards from the offshoot of the trail when I heard this strange beeping sound coming from Anderson Lake, and it was hypnotic in some sense that I had stopped to listen to it.