Just hours into sub's journey, Navy detected sound "consistent with an implosion." Experts explain how it can happen.

Navy may have detected Titan sub implosion on Sunday, official says After days of searching for the submersible that went missing in the Atlantic Ocean as it transported five people to view the wreckage of the Titanic, officials said its fate is no longer a mystery: it imploded in the depths of the sea, apparently within hours after starting its descent. Coast Guard Rear Adm.John Mauger said at a news conference Thursday that teams had found pieces of the missing sub "consistent with a catastrophic implosion of the vessel" in...