A sudden loss of clarity can come from moisture or debris on the lens, or from the camera entering cloudy water. It matters whether the image clears after the camera is withdrawn or remains obscured at the same place on another pass.
Find the last clear view
Ask the technician to mark the last point where the pipe wall was visible and to identify any features they could confirm. Keep the distance and direction with the clip. A blurred image alone is a poor basis for deciding that a pipe has collapsed.
Ask what would improve the view
Depending on what obscures the camera, the crew may clean the lens, clear an obstruction, or inspect from another access point. Ask which option is practical and what remains unknown if a second pass cannot be completed.
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