texts: Sound? </s> <s> Sound.  Like sonar, or radar. They home in on irregular sounds, unusual sounds, any rhythmic low- frequency vibration. </s> <s> So there's one around here.
labels: Not necessarily.  These wounds could've been inflicted 30 miles out to sea, or more.  None of them are immediately fatal.  Currents could've carried the body 10 miles further.