SONAR IS COMPLICATED (Submarine Shadow Zone) - Smarter Every Day 249

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This is the document you want to read:
https://fas.org/man/dod-101/navy/docs/es310/SNR_PROP/snr_prop.htm

https://en.wikipedia.org/wiki/Sonar

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Видео SONAR IS COMPLICATED (Submarine Shadow Zone) - Smarter Every Day 249 канала SmarterEveryDay