Imagine a silent world beneath the ocean, where darkness stretches for miles and the only clues about what lurks below come ...

Using his Echo system, Zur is spying on everyone in ... Fox quits working for Batman immediately after. It seems Zur's sonar tech is based off this idea from The Dark Knight.

This method involves measuring the time taken for you to hear an echo from a sharp clap, either made by hands or by banging two wooden blocks together. You stand a long distance from a wall ...

Norwegian Subsea is bringing its Motion Reference Unit (MRU) technology to sonar-based applications with the introduction of ...

It works in the same way as sonar but with radio waves in place of ultrasound. A short pulse of radio waves is transmitted and the time it takes for the reflection (the echo) to return is measured.