I have seen some research on Laser communication underwater, these are severely limited by the light diffraction....but what about Masers, is there a frequency that could cut through the water? How would it work? What frequency would most likely be immune to the properties of water? There are Masers that are capable of extremely low frequencies, and I have heard of low frequency communication underwater for long distances...What are your thoughts on this?
https://en.wikipedia.org/wiki/Maser
https://www.quora.com/Can-a-maser-penetrate-deep-under-water
https://spectrum.ieee.org/tech-talk/computing/networks/a-lownoise-diamond-maser-that-does-not-require-cooling
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