From military-grade drones to sensor systems and experimental technology, the EU and its members have spent hundreds of millions of euros over the past decade on technologies to track down and keep at bay the refugees on its borders.
In 2018, the EU predicted that the European security market would grow to ?128bn (?108bn) by 2020. Beneficiaries are arms and tech companies who heavily courted the EU, raising the concerns of campaigners and MEPs.
Air Surveillance
Refugees and migrants trying to enter the EU by land or sea are watched from the air. Border officers use drones and helicopters in the Balkans, while Greece has airships on its border with Turkey. The most expensive tool is the long-endurance Heron drone operating over the Mediterranean.
Sensors and cameras
EU air assets are accompanied on the ground by sensors and specialised cameras that border authorities throughout Europe use to spot movement and find people in hiding. They include mobile radars and thermal cameras mounted on vehicles, as well as heartbeat detectors and CO2 monitors used to detect signs of people concealed inside vehicles.
Poland is hoping to emulate Greece in response to the crisis on its border with Belarus. In October, its parliament approved a ?350m wall that will stretch along half the border and reach up to 5.5 metres (18 feet), equipped with motion detectors and thermal cameras.
Surveillance centres
Artificial intelligence
