Cameras near a wall may not be recording anything; they may not even be turned on.  Even if they are, they aren't necessarily recording outside events.  The concrete wall could be inside a windowless building such as a warehouse, which means the cameras could not record anything outside.


Context: Several video cameras lined up behind a concrete wall.
Hypothesis: Cameras are near a wall capturing the events outside.

Is the hypothesis incorrect? (Yes, no, or unknown)?