It could be that the whales have developed a work-around for the military submarine communication frequency/ies (?) - so they can still find each other and live and thrive. I just read on Wired that:
Among the suggested explanations are ocean noise pollution, changing population dynamics and new mating strategies. But none of them is entirely convincing.
Blue whale frequencies are between 10 and 40 Hz. Thanks for the post, feardia. I am going to look into
ELF (3 to 30 Hz) and military com more.