Sam Fisher- Sonar in Woods

  Fisher knifed past two more trees, broke hard left, and kept moving, with Briggs hard on his heels.

 They both had activated their sonar systems. The deep hues of the forest dissolved into the black-and-white contrast of an X-ray. The system relied on sonic pulses, combined with an advanced AI controller, to penetrate through objects and walls so that they could literally see through them to mark targets. Downtime between echoed bursts along with jamming vulnerabilities and distorted images while they were on the move were the system’s chief weaknesses, but the sonar did come in handy when obstacles and terrain made threat assessment difficult.

  Through that stark imagery Fisher watched as the chopper descended another twenty meters, then the crew chief lowered a pair of ropes. Two teams of troops came zipping down the lines like beads of crude oil across gleaming gossamers.

- Blacklist Aftermath, Chapter 7