Well done, nprofile1qqsvqses4kkaj5yvrtgudm0q4m2ajg4rv4czrym7yp26srqm9pjueacpp4mhxue69uhkummn9ekx7mq8zkrsf! Here is the answer:
A: A time traveler from the past unknowingly brought ice and an artifact, appearing in the locked room. As the ice melted and the artifact sank, the clock stopped at the moment of their arrival.
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(total cost: ⚡67)