Shortly after OceanGate's Titan submersible lost contact, the US Navy, according to a navy official, heard sounds "consistent with an implosion.".
The ship was carrying five people when it vanished on Sunday while being towed to the Titanic wreck.
After an extensive search mission, the sub's loss was confirmed on Thursday.
The official told CBS News that the US Coast Guard had focused its search after using their information about the "acoustic anomaly" to do so.
Rear Adm. Mauger, district commander of the Coast Guard, had earlier on Thursday confirmed that all five aboard Titan had perished in what was likely a "catastrophic implosion" based on the patterns of debris found.
The search mission, he claimed, had not turned up any sounds that were consistent with this.
"We have nearly always had sonar buoys in the water, and during that time, we have not detected any catastrophic events. ".
The discovery of "underwater noises" in a search area for the missing vessel by a Canadian P-3 aircraft was confirmed by the US Coast Guard on Wednesday.
This gave rise to fresh optimism that the Titan's crew might be discovered alive and prompted the Coast Guard to move its base of operations.
These sounds, according to CBS, are now believed to have originated from nearby ships.
