For over a decade, "Titanic" stood as the world's top-grossing movie, an epic tale of love, adventure, disaster and sacrifice. When it was made, James Cameron was lauded for his attention to detail and accuracy, but modern technology and new theories are telling a different story of what really happened to the "unsinkable" ship. We interview historians, engineers, and scientists for their expert testimony. We even set simulated sail aboard a virtual Titanic to retrace the final moments before impact, and get to the bottom of the truth.

• Leonard Nimoy
• Rod Roddenberry