It's a pretty old idea, too. https://en.wikipedia.org/wiki/Acoustic_mirror https://en.wikipedia.org/wiki/Acoustic_mirror https://www.cnn.com/style/article/war

It's a pretty old idea, too. https://en.wikipedia.org/wiki/Acoustic_mirror https://en.wikipedia.org/wiki/Acoustic_mirror https://www.cnn.com/style/article/war-sound-locators-before-radar https://www.cnn.com/style/article/war-sound-locators-before-...