In this May 22, 2019, file photo, a shark warning warns beachgoers at Lecount Hollow Beach in Wellfleet, Mass. Scientists monitoring the white shark population in the waters off Cape Cod are stepping up their game by attaching more highly sophisticated sensors that include cameras to the predators to help keep beachgoers informed and safe, researchers said Tuesday, June 13, 2023. (AP Photo/Charles Krupa, File)