That too - ELF is Nikola Tesla mad science brought to life, using an entire power station to energise two electrodes fifty to sixty kilometers apart, to turn the Earth into your antenna.
It's actually based directly on Tesla patents. Tesla's wireless systems used the Earth as a transmitter. After Tesla died, his patents were classified, and everyone started using less effective Marconi style aerial transmission.
More importantly, in the context of submarines, ELF is receive only.
That too - ELF is Nikola Tesla mad science brought to life, using an entire power station to energise two electrodes fifty to sixty kilometers apart, to turn the Earth into your antenna.
It's actually based directly on Tesla patents. Tesla's wireless systems used the Earth as a transmitter. After Tesla died, his patents were classified, and everyone started using less effective Marconi style aerial transmission.