(FILES) In this file photograph taken on April 4, 2019, a French Gendarme looks through a pair of binoculars during a patrol of the beaches at Tardinghen near the northern port city of Calais. - For a year, these "land" gendarmes have been carrying out surveillance, intelligence and rescue missions in the 300-metre strip along the Opal coast. (Photo by Denis Charlet / AFP)