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 ...

Think of these as deeper, or more rumbling sounds. The sound of the ocean is also a low-frequency sound. That’s why it sounds similar to the sounds caught in a shell. The sound you hear when you ...

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 ...