I'd like to know more about this process. But ultimately, it can only be detrimental to sealife to emit noise into the marine environment.

Imagine someone set up a radio or a noisy machine somewhere in your own vicinity and you had no choice but to listen to it (even at a low volume) all day and night, perhaps for the rest of your life. Tests might or might not show that you were stressed, but you most certainly would be.

Perhaps I am biased from regular snorkelling and enjoying being immersed n a different natural world, and for sure I do have tree-hugger tendencies. But I find it extremely arrogant that our species thinks it's acceptable to inject noise pollution into an environment inhabitated by thousands of other species.