Jealous Robot Ray

Maybe I am on my "Kennedy kick" after all. I picked up LIBRA and started reading it. Almost right away we come to the CIA plotting to blow up Castro with "a sea shell that would explode when he went swimming." Now, this is part of that Norman Mailer novel I just read, too. And a tiny bit of "internet" research indicates it was a real plan right here in real life where we all live. But Mailer's narrator wants to train a manta ray to jealously guard the beauteous shell so it will seem more attractive and desirable to Castro. Mailer has him down as a big shell collector. And the "internet" tells me that the CIA did intend to "make the shell brightly colored and unusual looking so it would be sure to attract Castro’s attention." So Mailer's narrator schemes to train the jealous manta ray but finally decides a robot manta ray would work better. I assume the trained or robotic fish idea is all Mailer's... eh... I don't want to know.