This is one of those things where the odds are infinitesimal, but the result of being unlucky are absolutely catastrophic. It happens to very few people. When it happens, your life is over. You will spend the rest of your life looking for and longing for your child to come home. And of course it isn’t just your life that became awful, and the things you may imagine are happening to your child could be exaggerated or wishful thinking, and how will you know?