DRDO makes Navy 'see' in the water

If you have watched some of the widely acclaimed submarine movies such as U-571, Das Boot or The Hunt For Red October, you’ll recall how navy personnel manning underwater war machines have used sonar technology to navigate and detect objects on or under the surface of the water, such as other vessels. Sonar, an underwater equivalent of radar, is used to find and identify objects in water. It is also used to determine water depth and is applied to water-based activities because sound waves attenuate (taper off) less in water as they travel t…