Is it conceivable for a comparably modest diesel-electric submarine to evade the multiple layers of defense of a U.S. Navy ...

Imagine a layer of the ocean so teeming with life that, when first discovered, scientists mistook it for the seafloor. This ...

STRIKE a metallic object, and you’ll hear a sharp clang. Knock on wood, and you get a dull thunk. It’s the basic principle behind sonar – sound waves reflecting off different objects.

Sonar isn't harmless and isn't something vessels use all the time. In fact, the sound waves used in sonar sweeps can be dangerous, even deadly, especially to marine wildlife.

Sound waves are produced by a vibrating object. Everything that makes a sound must have a part that vibrates.

Types of Sonar: Active vs. Passive There are two types of sonar: active and passive. Active sonar involves a warship broadcasting directed sound waves underwater: If the sound waves strike an ...

GPS and radar can scout out missing objects on Earth's surface but are no match for the ocean. Water absorbs electromagnetic radiation, which is why sonar tech using sound waves is necessary. But ...

Designed to go anywhere you do, portable fish finders emit a small sonar sound wave through the water, and when that sound wave hits objects beneath the surface, such as fish, they measure the ...

UChicago Medicine is using a new technology to destroy liver tumors without radiation, chemotherapy or even cutting the skin.

Sound, however, travels very well and far under water. This is because water is much denser than air, and so can respond faster and better to acoustic pressure waves – sound waves.

However, humans aren't the only ones to use sound waves to make sense of their surroundings. Many animals rely on echolocation or biological sonar to live, especially in the ocean.