Abstract: A surveillance system in which a video camera (7) is displaceable inside a transportation tube (1) along any direction in three-dimensional space under the effect of a compressed fluid. The transportation tube (1) is provided with at least one longitudinally-extending transparent observation window (2). The camera (7) is contained in a displaceable "torpedo" (8) and has its optical axis running parallel to the axis of the tube (1), and it receives images through the window (2) by means of a mirror (11) having two faces at an angle with the common edge running vertically and intersecting the optical axis (12), thus enabling the camera to transmit simultaneous left and right looking images to a central control station by a microwave beam.

Abstract: The surveillance device uses a surveillance unit such as a video camera, the signals from which are received by a detection unit, the device being mounted on a mobile chassis driven by propulsion means inside a tube equipped with a longitudinal window through which passes the the transverse axis of sight of the surveillance unit, wherein the window is covered by a longitudinal elastic flap one side of which is attached to the tube, the other side remaining free, shaped elements attached to the chassis raising the longitudinal flap on either side of the axis of sight and beyond this axis. This device can be used for surveillance over long distances.