A series of knocks were heard but the walls were solid. How was the message transmitted?
Category: Mystery · Difficulty: hard
Hint: Consider alternate ways sound or signals can move through structures.
Answer
Vibrations traveled through the pipes
Explanation
Vibrations conveyed the knocking sounds through connected plumbing, allowing communication without direct contact.
This is a hard mystery riddle — a tricky one that takes a little thought. The answer is Vibrations traveled through the pipes.
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