In february 1965, ambient noise wias measured at a depth of 250 feet in 3400 feet of water near Andros Island, Tongue of the ocean, utilizing a buoyed self recording instrument. The instrument measured and recorded on photographic film noise levels over a one octave hand-width having centers at 5.4, 10.5, 22, and 40 khz. Noise levels were low during daylight hours and high at night indicating t…