Phantom- Underwater Singing

  I had no sooner put off from the bank than the silence amid which I floated on the water was disturbed by a sort of whispered singing that hovered all around me. It was half breath, half music; it rose softly from the waters of the lake; and I was surrounded by it through I knew not what artifice. It followed me, moved with me and was so soft that it did not alarm me. On the contrary, in my longing to approach the source of that sweet and enticing harmony, I leaned out of my little boat over the water, for there was no doubt in my mind that the singing came from the water itself.
...
  He laughed and showed me a long reed.

  “It’s the silliest trick you ever saw,” he said, “but it’s very useful for breathing and singing in the water. I learned it from the Tonkin pirates, who are able to remain hidden for hours in the beds of the rivers.”

-Chapter XXI