The Titanic was the biggest, most luxurious passenger ship the world had ever seen; the ads proclaimed it to be unsinkable. When it sank in April 1912 after hitting an iceberg, killing more than 1,500 people, the world was forever changed and the public has been spellbound ever since. Now, a century later, the Titanic is about to disappear again: its infrastructure is set to collapse in the next few years. In...