After rewriting history with their discovery of a Nazi U-boat off the coast of New Jersey, legendary divers John Chatterton and Richie Kohler decided to investigate the great enduring mystery of history's most notorious shipwreck: Why did Titanic sink as quickly as it did?

To answer the question, Chatterton and Kohler assemble a team of experts to explore Titanic, study its engineering, and dive to the wreck of its sister ship, Brittanic, where Titanic's last secrets may be revealed.

Titanic's Last Secrets is a rollercoaster ride through the shipbuilding history, the...