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This got my curiosity peaked. I was able to dig up an open source GPR rig that even utilizes building a rover to do scanning. https://hackaday.io/project/4440-open-ground-penetrating-rad...
Just took a tour on http://hackaday.io , it's refreshing to browse through what feels like genuine innovation.
Definitely check out the hackaday prize finalists; everything in the top ten every year is usually spectacular. Example: https://hackaday.io/project/5030-low-field-mri