It could be used to find downed planes underwater by reading signals from sonar devices in a plane’s black box.

The images of the seabed are gathered by sonar devices coasting at walking pace, less than 100 metres above the ocean floor.

Today, explorers use magnetometers that can detect buried metal, sonar devices, hydraulic dredges, and machines called prop-wash deflectors that help blast sand off the ocean floor.

The nuclear-powered boat was unable to dive after the accident, which also damaged sonar equipment mounted in her bows.

Divers used sonar equipment to locate his body in the water.

Conservationists say that the 'industrialisation' of the sea and the use of sonar equipment damages whales' communication and navigational systems.

Had she been confused by military sonar equipment, or was she lost after taking a wrong turn?

Teams in canoes have been combing the riverbanks and using sonar equipment.

Its remains, discovered in 2008, are shown in a sonar image, right.

Next the transducers evolved to fan-shaped beams to produce a better sonogram or sonar image.

Sonar images reveal a unique bronze cannon engraved with dolphins as well as a host of arms and ceramics.

He failed to find anything substantial, though he did capture a sonar image of two creatures, 68 feet (1.8 to 2.45 meters) long, at a depth of 24 ft.

Sonar images have so far revealed bronze cannons made specifically for the ship, arms, ceramics and other artefacts.

They will do a thorough sonar scan of the area, then send a remotely operated vehicle.

The new high-resolution sonar scans have shown that at some point during the next 250,000 years, this natural dam broke.

The group searched about 27 square miles of the lagoon and sonar scans identified debris at 61 sites.

Scientists have previously discovered channels running along ocean floors, based on sonar scanning.

In 2003, scientists conducted a series of sonar scans to determine local fish populations.

The transmitter may be triggered by a coded sonar signal from the surface or a timer.

Sonar signals used by underwater sensors reflect off the surface of the water rather than reaching the air.

Sonar signals of the sea lion.

Two of the main questions with regard to bottle-nose navigation were whether bottlenose dolphins produce sounds serving as sonar signals and whether they decode the echoes bouncing back.

Faster, more powerful catcher vessels, and eventually the introduction of sonar technology, made for more efficient capture.

They are using sonar technology to see if any other underground dungeons exist.

The money has allowed new vessels to be equipped with sonar technology and satellite navigation to hunt for tuna.

In addition, sonar technology gave an edge to catching and detecting fish.

Dolphins have powerful biological sonar, unmatched by artificial sonar technology in detecting objects in the water column and on the sea floor.