And if they're paying real close attention, they might just catch a glimpse of the periscope as it draws closer to the speed boat...
As an extra bonus, the people on the fishing boat will hear the commotion drifting across the waters in the darkness, but never saw what happened.
Just imagine the stories that'll end up passing around when they can't figure out what's happening to thier cohorts. Probably everything from Moby Dick, sea monsters demons to Elvis and UFOs.
But we'll know...