The games' organizers have employed the use of helium-filled 'eyes in the sky' to watch out for suspicious behavior

Initially developed for use by U.S. forces in Iraq and Afghanistan by Logos Technologies, a Fairfax, Virginia-based startup, Simera is an unassuming balloon tethered some 200 meters from the ground which offers aerial views of large areas (up to 40 square kilometers at maximum height to be exact) in real time. The camera-equipped surveillance, equipped with 13 cameras, which record 120-megapixel imagery of vehicle and pedestrian movements, adds an efficient layer of security for up to three to four days at a time, and has just found its latest home in the Rio de Janeiro Olympic Games.

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