Comment by IAmBroom

> I believe something like 10 years ago, the declassified sonar capability was that it could reconstruct a 3d image of a goldfish 10 miles away.

I'm in optics, not sonar, but I have a hard time believing that sound waves are such unbelievably reliable tools for accurate FFT's of a target. Ultrasonics begin at 100 mm, while "long" visible light is 200x shorter (and wavelength is proportional to resolvable detail). Noise and dispersion in the ocean are significant.

Reminds me of when the CIA planted stories that they could recover data from multiply-erased hard drives using electron scanning microscopes. Possibly - one bit at a time.