> It's extremely hard to communicate long distance underwater, especially to do so discreetly.
How does existing submarine cable infrastructure carry communications to subs?
Low-frequency AC current in the shield, data picked up magnetically?
How does existing submarine cable infrastructure carry communications to subs?
Low-frequency AC current in the shield, data picked up magnetically?
Contrary to the other reply, ELF is not used and is impractical: https://en.wikipedia.org/wiki/Project_Sanguine
For VLF you can drag a very long antenna behind you, but most submarines just launch a buoy with a normal antenna to the surface and a fiber connection to allow them to stay below the surface.
https://www.navalnews.com/naval-news/2022/04/communication-a...