However, a spokesman for the Ministry of Defence said: 'the Royal Navy can confirm that they were not in the area using sonar and have not been for some time.
The ports on the front weren't speakers—they were sonar detectors that would calculate a runner's speed, which would then be announced over a pair of headphones.
Cavitation is noisy and easily detected by sonar.
We picked up two submarines on sonar.
Having been suggested by a bat, people invented sonar.
The largest of the microbats, this white-furred cave dweller found across northern Australia also counts lizards and frogs among its prey, and uses its eyes as well as sonar to hunt.
Not only has the Loch Ness Monster been photographed repeatedly, it has even been caught on videotape - as recently as 2007, and on sonar equipment.
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