Principles of underwater sound essential to understand sonar
XD6679 Introduction to Underwater Sound
About Us
Thanks for your interest in the Periscope Film stock footage library. We maintain one of the largest collections of historic military, aviation and transportation in the USA. We provide free research and can provide viewing copies if you can let us know some of the specific types of material you are looking for. Almost all of our materials are available in high quality 24p HD ProRes and 2k/4k resolution.