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Did he see like an xray (eg densities) or did just the walls become 'invisible' to him?
In the 1920s the British military used these vast concrete parabolic 'sound-mirrors' to detect approaching aircraft. The 'Listening Ears' at Denge have recently been designated as a historical preservation site by English Heritage, the government quango in charge of protecting national landmarks.
On thinking further, a larger drum gets lower in pitch, but not necessarily louder... I wonder how they bioniced 'the bionic man's' ear?
BTW did anyone hear a news item about a guy with a wireless tv camera in an eye socket, as a prosthetic. He does investigative reporting - the ultimate hidden camera!