第174話: 奇妙な船の出現により、アトムは日本 beneath に潜む可能性のある海底トンネルの調査を始める。

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Strange incidents start occurring, such as an event where a vessel that had disappeared in the Japan Sea turns up in the Pacific Ocean. Dr. Ochanomizu thinks that there could be a submarine canal right beneath Japan. So Atom goes in search of the canal, and encounters subterranean people on the ocean floor. (Source: Tezuka Productions)