Can't edit my post to fix the img tag.

There is a possibility that someone found a way to close down the area.
We are not the only country to train dolphins to carry explosives on their backs.
For the last 40 years all countrys have been working with chemists to find a shark repellent for their Navys.
So far nothing is 100% accuract.
Now some one decides to do this backward and find a way to not repell but to intice sharks into a chosen area.
Say Hey, techonogy and study by 300 diferent nations will come up with some amazing things .Chum works we know but what about sonic signals sent out that call the sharks in.?