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"I think crypto will slowly percolate its way up and people will adopt it gradually as user friendly, cheap products, become available."
- Neal Stephenson

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

Deep-Radar-related news articles:
  - GINGER Moon Radar Benefits Miners On Earth

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