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.

The recording, released by a defense website, comes from a National Oceanic and Atmospheric Administration recorder that was monitoring the area at the time.

Nearly two years after the OceanGate Titan implosion, the U.S. Coast Guard has released a chilling audio recording that seemingly captured the submersible’s final moments. The roughly 20-second clip,