Radio waves don't work great under the oceans. https://en.m.wikipedia.org/wiki/Communication_with_submarines?wprov=sfla1 https://en.m.wikipedia.org/wiki/Commun

Radio waves don't work great under the oceans. https://en.m.wikipedia.org/wiki/Communication_with_submarines?wprov=sfla1 https://en.m.wikipedia.org/wiki/Communication_with_submarine...