We know the origins of these diamonds.

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"We understand precisely where these jewels originated," one officer revealed. "We have been surveying these waters for several days. The gems were taken from the National Museum during a significant robbery." The complete value reached an estimated $20 million. Mark wondered how such treasures found their way inside a fish.
As a result of several sources

Based on multiple reports, the criminals had discarded their stolen goods into the lake, attempting to conceal the evidence. Until this moment, nobody had managed to retrieve the stolen items. Perhaps the sparkling gems caught the fish's interest, causing it to consume them. However, if one fish had ingested such valuables, an urgent question remained: where were the others? The authorities felt particularly concerned about the thieves' future actions.