French gendarmes patrol while a police helicopter fly over the beach of Oye-Plage, near Calais, northern France, on January 9, 2019 as they try to intercept migrants attempting to cross the Channel. - The number of migrants attempting to cross the Channel, one of the world&apos;s busiest shipping lanes, rose to 504 last year, up from a mere 13 in 2017. (Photo by Philippe HUGUEN / AFP)