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.

After nearly two years, an audio recording of the Titan submersible's moment of implosion has been released. Here's what we know.

The recording was captured by a National Oceanic and Atmospheric Administration passive acoustic recorder that was about 900 miles from the implosion site.