For more than 2,000 years, explorers have searched for any trace of the legendary Utopian civilization that sank beneath the ocean. Now, experts imagine what would happen using modern engineering to build an underwater megacity for a modern-day Atlantis. 

The Titanic pushed the boundaries of engineering and luxury like never before, but it's also the most well-known disaster; experts use cutting-edge tech to discover if a modern vessel of equal opulence could be successfully built for the sea today.