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Unknown origin: 'Quack-like' sounds heard in the deep ocean remain a mystery
Explore the mystery of quack-like sounds off New Zealand's coast in the 1980s that may hint at deep-sea communication.
Quack-like underwater sounds off the coast of New Zealand in the '80s may have been a conversation, researcher says
Mysterious, repeating sounds from the depths of the ocean can be terrifying to some, but in the 1980s, they presented a ...