A series of underground tunnels were used to smuggle items unnoticed. How were they discovered?
Category: Mystery · Difficulty: hard
Hint: Investigate indirect sources of information about hidden spaces.
Answer
Data from sewer inspections revealed paths
Explanation
Routine sewer inspection data showed unusual passageways, leading authorities to uncover the secret tunnels.
This is a hard mystery riddle — a tricky one that takes a little thought. The answer is Data from sewer inspections revealed paths.
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