Place it just after the screen goes dark and before the reveal, so the line bridges the blackout and the next scene. Follow it with the SpongeBob Fail sound for a stumble, or use the Vine Boom sound when the lights snap back on for a sudden jolt.
Über diesen Sound
This is a short German voice clip, just under four seconds long, in which Patrick says it is so dark in here. His flat, matter-of-fact delivery makes the simple complaint land as a small, awkward observation rather than a shout for help. It feels confused and a little helpless, the kind of line that fits a moment when someone is stuck somewhere dim and cannot quite believe it.