Investigators Simon Day and Steven Ward believe that the island of La Palma will one day trigger a tsunami the likes of which no one has ever seen. The island of La Palma, off the northwest coast of Africa, is the picture of tranquility. La Palma's beauty however belies a hidden danger -- a secret threat that two scientists suspect could forever change the world. Investigators Simon Day and Steven Ward believe that the island of La Palma may someday trigger a tsunami the likes of which no human has ever seen - a mega-tsunami. It's a controversial theory, but Day and Ward stand by their research. Follow them as they gather evidence to support their case on the island of La Palma - from caves harboring cryptic clues to dramatic craters and computer models. According to their research, under the worst-case scenario, a massive chunk of La Palma could break free and plunge into the sea-spawning waves that could rip across the Atlantic at staggering speeds and destroy coasts from Canada through the United States, the Caribbean and all the way down to Brazil.