Raytheon's Swimmer Denial System
Raytheon has developed a "Swimmer Denial" underwater audio system for ship protection. Underwater sensors automatically detect an intrusion, triggering extremely powerful low frequency sound waves, resonating the internal organs of the swimmer, causing the swimmer's internal organs to rupture.
They do assure us that:
"Would-be spies or terrorists cannot get through the ring but there is no widespread danger to fish, dolphins or whales."
I wonder how they define "Widespread" ?
Here's the entire article from Cyber Diver News Network.