In 1845 two ships led by Sir John Franklin left England searching for a northern route across the globe, known as the Northwest Passage. They never returned. 169 years later, a helicopter pilot found a clue that led the Canadian government to one of the missing ships. From sonar imaging to video cameras on submarines, archeologists have confirmed that this is one of the abandoned ships from the famous expedition. Listen to hear about the haunting story this discovery has unearthed.