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Helios can detect the sound of footsteps and vehicles and is capable of tracking them. It can also do this with multiple events. When two vehicles are tracked along the fibre it is possible to see the acceleration of the second vehicle as it pursues the first vehicle. Similarly, as one person is pursued by another, it is possible to see two events correlating to their footsteps. The system is so sensitive, it is even possible to detect a hand going onto the fence.
