# SOUNDS IN THE SILENT DEEP HYDROPHONES UNDERWATER SOUND DOCUMENTARY 25434

Also released in slightly different form as "Voice of the Deep". this vintage Moody Institute of Science film explores the nature of sound in the deep sea. The film charts the early use of undersea hydrophones to listen to sounds beneath the sea, and the invention of sonar at the 6:00 mark. At 6:17 , hydrophones at Chesapeake Bay are shown in 1942, used for national defense, detecting croaker fish. At 7:58 , Moody Science explorers are seen getting into a deep sea diving suit to record the first ever underwater sound motion picture. At 10:00 , the University of Rhode Island's Narragansett Marine Laboratory is seen, cataloging hundreds of sounds made by different species using a spectrograph. At 13:40 , dolphins are seen performing at Marineland, and a study shown of a dolphin's ability to distinguish items underwater is made using sonar. At 20:30 , humpback whales are seen producing underwater calls. At 22:54 , a Nagra or similar tape recorder is seen being used in the field to record underwater sound in the arctic. In its conclusion, the film examines a whole series of conclusions that were wrong in "matters of life and death importance". The Moody Institute of Science (MIS) was founded in 1945 by the Moody Bible Institute and Irwin A. Moon as an evangelical group that used science demonstrations to preach to the masses. A California pastor who had been using science experiments in his sermons since the early 1930s, Moon believed that the marvels of science provided…

- Kind: Documentary
- Genres: Documentary, Silent, Industrial and advertising
- Archive: [Internet Archive](https://archive.org/details/25434SoundsInTheSilentDeep)
- Licence or status: none stated by the archive
- Who can watch: Tweens profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

[Watch now](https://invisiblenetwork.ai/watch/archive/ia/25434SoundsInTheSilentDeep?play=1)