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 ...

If you hold up a seashell to your ear and listen, you may hear what sounds like rolling waves and wind. But it’s not actually the ocean. Now that we’ve got that out of the way, what exactly is ...

And we see an opportunity — over 70 percent of the Earth’s surface is covered by [the] ocean. So, only a tiny fraction of that is being detected using sound today. And then defense is another ...