The NATO Science and Technology Organization’s Centre for Maritime Research and Experimentation has developed a standard for underwater acoustic communications called JANUS, which is recognised as a NATO standard by all NATO Allies since 24 March 2017. This marks the first time that a digital underwater communication protocol has been acknowledged at international level and opens the way to develop many exciting underwater communication applications.
I think this might become important to us. It is not just a military system.
Thanks to EagleSpeak for bringing this to my attention.