San Francisco Bay is home to various shark species. Alcatraz guards made sure the prisoners knew it, telling stories of sharks to stop escapes.The worst of the worst, the toughest of the tough were all sent to The Rock. And they all wanted to escape. But their biggest obstacle wasn't the walls, the bars, the razor wire, or the guards - It was the sharks. And the guards made sure all the prisoners knew it. That's why they call it SHARKATRAZ. We'll investigate the frightening shark myth the guards used to prevent escapes.