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"[Science fiction is ] That branch of literature which is concerned with the impact of scientific advance upon human beings."
- Isaac Asimov

Deep-Radar  
  Device to image within large objects, even within mountains.  

I wish I knew the mass and bulk o fthe machine," the puppeteer continued. "The Ringworld spacecraft are tremendous things. but we need not transport it. If necessary, a hologram taken by deep-radar, and holograms of the mechanism in action, should be enough to convince my subjects.
From Ringworld Engineers, by Larry Niven.
Published by Del Rey in 1980
Additional resources -

Deep-radar could also be used to find specific objects within mountains.

On the surface of Canyon there were mines, and there was a large, indifferently tended preserve for the surviving varieties of Canyon lichen. But most of the world was barren moonscape. A careful man could land a spacecraft undetected, and could hide it where only a deep-radar search would find it. A careful man had. For these past nineteen years Louis Wu's ship had been waiting, hidden in a cave in the northward-facing cliff of a mountain of low-grade metal ore: a hole hidden within permanent shadow on Canyon's airless surface.

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Additional resources:
  More Ideas and Technology from Ringworld Engineers
  More Ideas and Technology by Larry Niven
  Tech news articles related to Ringworld Engineers
  Tech news articles related to works by Larry Niven

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  - GINGER Moon Radar Benefits Miners On Earth

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