I don't know if you've seen or heard of (OK) the recent development regarding the **** train found in Poland. Looks like it's really happening, and looks like a deep ground radar showed pic t ures of a radar scan of the deep underground showed something that the officials are sure about that it is a train . That's my version.
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Perfect Stranger1) seen and heard of together in one sentenceThat's fine.
Perfect Stranger2) deep ground radarThis is unnatural. Ground-penetrating radar is more natural, as the first line of the article here http://www.b