This is not the first time mysterious balls have appeared on Sydney's beaches. In October 2024, about two thousand black balls, the size of golf balls, were found on beaches like Bondi and Coogee.

SYDNEY, Dec. 19, 2024 /PRNewswire/ -- This summer, SEA LIFE Sydney Aquarium is excited to reopen the beloved 1.7 million litre Day and Night on the Reef oceanarium, while simultaneously launching a ...