Although these are called lakes, the deepest point in any of them is only about 20 inches. They provide excellent reflection ponds for the stalactites that hang above them. Great reflections are possible when there is absolutely no water movement. That sign at the right border indicates the channel # to tune to in order to hear particulars about that area of the cave. Each visitor is given a head set at the beginning of the tour. There are many stations along the tour.