midjim said..
After reading that paper clipping, I have just solved our shark attack problem maybe. Why can't we record the killer whales and have a under water recording going off a buoy at popular beaches . A few problems I see is the Humpbacks would be scared off these areas and hopefully other killer whales do not com in to investigate, just a thought but a pretty simple one.
Did you know that is actually being tested as a deterrent currently

This is interesting as it shows a map of the areas to be affected.
http://www.swellnet.com/news/surfpolitik/2015/04/10/proposal-move-shark-cage-diving-closer-south-oz-surf-spots