"Authorities say European Union border agency Frontex has provided the Greek coast guard with a crewless blimp to help combat illegal immigration and to augment search and rescue operations in the eastern Aegean Sea."
EU gives Greece blimp to monitor migrants (ekathimerini.com, link):
“Greece’s Shipping Mministry says the 35-meter (115-foot) airship can fly as high as 1,000 meters (3,300 feet) and will be tethered to the ground on the island of Samos, which is close to Turkey’s coast.”