Navy detected implosion day sub went missing

The U.S. Navy detected what it suspected may have been an implosion within hours of the Titan submersible descending into the ocean to visit the Titanic wreckage. A U.S. defense official said the Navy began listening for the Titan immediately after the vessel lost communication with the mother ship, approximately an hour and 45 minutes into its mission Sunday morning. LiveNOW's Andrew Craft spoke with expert Sal Mercogliano about the "catastrophic" implosion and when the Navy could have detected it. More LiveNOW from FOX streaming video