I’m pretty sure I don’t know what you mean. When did reading become a novelty?
Dual-Frequency Identification Sonar (DIDSON)
http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=1002424
"The new survey involved sending a diver down with a DIDSON sonar -- a novel system that uses sound instead of light to 'illuminate' objects rather like a torch and means objects can be identified even in muddy water. "