According to Tom Clancy, in "The Hunt for Red October" there is a transmission of coded groups to very deep operating "Boomers" at a data rate that appears to be in the region of a bit per second (on
[snip] Speculatively of course, this would be at a frequency in the 60 - 170Hz region - which makes even amateur 9kHz experiments seem tame. It is stated that in the US there are lines looking like
According to Tom Clancy, in "The Hunt for Red October" there is a transmission of coded groups to very deep operating "Boomers" at a data rate that appears to be in the region of a bit per second (on