More than 80 percent of the world’s oceans remain unmapped and unobserved, according to NOAA. Since the 1990s, a network of hydrophones originally built to monitor nuclear weapons testing has picked ...

Ocean researchers have recorded unidentified "quack" sounds in the sea for years. Credit: Mayehem / Getty Images Both scientists and sailors alike have recorded unique, strange noises in the ocean for ...

Our fascinating and magnificent planet is filled with countless different sounds of nature. While many of us experience nature's cacophony of sounds on land and in the sky and hearing them makes us ...