Well, yes but no. Hence the doomsday planes specifically made to communicate with deep sea subs https://en.wikipedia.org/wiki/Boeing_E-6_Mercury https://en.wik

Well, yes but no. Hence the doomsday planes specifically made to communicate with deep sea subs https://en.wikipedia.org/wiki/Boeing_E-6_Mercury https://en.wikipedia.org/wiki/Boeing_E-6_Mercury Tl;dr attenuation of signals in water is frequency dependent, just like in air or walls, etc. So the plane has a 5 mile long antenna