Newly released audio appearing to be from the 2023 Titan submersible implosion that killed five people has emerged.

The U.S. Coast Guard’s Marine Board of Investigation released the harrowing audio courtesy of NOAA/NPS Ocean Noise Reference Station Network on Feb. 7 as the investigation into the deadly implosion continues. The 23-second clip, recorded from approximately 900 miles away, featured white noise interrupted by an ominous rumble.

The Titan submersible was on a deep sea journey to view the sunken Titanic ship on June 18, 2023, when it lost communication nearly two hours in. There was an extensive search and a countdown to find the missing submersible, but ultimately the Coast Guard found presumed human remains and debris.

In previous audio from the time, listeners could hear repeated, rhythmic banging. The banging was suspected to be a cry for help from the Titan occupants. However, a U.S. Navy analysis later concluded that the banging was likely from ocean noises or other search ships, and didn’t indicate that the occupants were still alive.

Despite the search — and the banging — experts said that the five occupants likely died instantly in the implosion.

The tragic incident occurred after several red flags indicating major vehicle safety issues were glossed over, costing the lives of OceanGate CEO Stockton Rush, Hamish Harding, Paul-Henri Nargeolet, Shahzada Dawood and Suleman Dawood.

A ticket on the foredoomed submersible reportedly cost up to $250,000.

OceanGate’s website says that it has suspended all of its operations.