Oh okay.

After reading The [absolutely fucking amazing and awesome] Hunt for Red October, I have also decided that we need more stealth systems, and sound sensors. Sit in total camouflage, so camouflaged that you can't even see via regular sensors, but [i]listen.[/i] Unless it's a busy place or something, you could just sit there and listen for the thumps of footsteps, the motors, the engines, the exhausts.

mhm.