This picture taken on October 16, 2024, shows a general view of Maroubra Beach after authorities closed down two adjacent beaches in Sydney. Authorities were baffled earlier this week when thousands of black spheres -- sized between a golf ball and a tennis ball -- were found littering the shores of tourist haven Coogee Beach, that later identified as petroleum-based "tar balls", after chemical testing. (Photo by Saeed KHAN / AFP) (Photo by SAEED KHAN/AFP via Getty Images)