Toward the end of the film, the VLF antenna is raised. VLF is the acronym for the Very Low Frequency radio spectrum, used by submarines because VLF signals can penetrate up to forty meters of salt water. This allows submarines to receive messages while submerged. In addition, the very long wavelengths (10 to 100 kilometers) make it impossible to precisely determine the location of a VLF signal.

Film

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