Sound carries a huge distance from the ground
Indeed it does. I had a few years of fun in balloons and once drifted across a field of long grass. Right in the middle were a couple who thought they were completely hidden from sight. They were engaged in what is best described as and act of lovemaking. When we were directly overhead, I bellowed out "What do you think you are doing !". The resulting panic was a sight to behold as they ran like the clappers while trying to put on their clothes.