A Saildrone ‘Voyager’, uncrewed surface vehicle (USV), is moored at the Koge Marina in Koge, eastern Denmark, on June 16, 2025. — AP
KOGE MARINA, Denmark: From a distance they look almost like ordinary sailboats, their sails emblazoned with the red-and-white flag of Denmark.
But these 10-meter (30-foot)-long vessels carry no crew and are designed for surveillance.
