The U.S. Coast Guard has released audio captured from an underwater recorder that appears to include the sound of the Titan submersible imploding in the fatal accident that killed five people in 2023.

The sound of the implosion was captured on June 18, 2023 by a moored passive acoustic recorder roughly 900 miles away from the deadly event. The brief clip begins with a few moments of relative silence before a deep, sustained rumbling that nears 400 Hz, according to an accompanying frequency graph.