A recording released by the federal government appears to include audio of the implosion of the experimental submersible that went missing on its way to the wreck of the Titanic.

Just over 50 years ago, paleontologist Donald Johnson unearthed the remains of "Lucy," an ancient human relative who lived more than 3 million years ago. Now, another group of scientists have found new clues about what life was like in Lucy's time, including the surprising discovery of early tools dating back three million years.

A passive acoustic recorder located around 900 miles from the implosion site picked up the sound, US Coast Guard officials said in a statement.