Researchers are searching for the world's most elusive shipwrecks, with some recent discoveries being made in the great lakes, including a 139-year-old ghost ship in Lake Michigan and a 300-foot whaleback boat in Lake Superior. Other shipwrecks are also generating interest, including a 50-year-old one that has become a topic of discussion on social media. The hunt for these shipwrecks is ongoing, with some discoveries shedding light on historical mysteries.