Broadband vs narrowband sonar

[Hitman]

I guess my point is, the technology isn't that special and doesn't need to be so secret, but the application of the technology should be. I.E. missions and operations.

I don't think that the technology itself is so secret, it's the real world efectiveness of it what is top secret, i.e. what they can or can't detect, what they can or can't hide, etc. Processor power is one thing, but that power might be sufficient if the data the sensors can collect is already detailed enough, or inversely, more processor power might be unnecessary because the current sensor technology can't provide more accurate data to be processed.