Former Royal Navy commander Chris Parry told Sky News he finds stories of “banging” underwater “pretty spurious”.
He said: “You’ve got Titanic banging away with all its deteriorating structures.
“I have to say, from my own experience, using sonobuoys, you know pretty instantly what the sounds are – whether they’re the sort of thing you’re looking for.
“So I just wonder if they’re actually slightly embarrassed by making such a story of this.”
He went on: “To my mind, the Titan was going down to the Titanic.
“If that’s where she was going, that’s where you start your search and you expand it out in circles.
“And I’m really worried in case these spurious sounds may be taking people away from where the Titan might be.”
It could be a “wild goose chase”, he added.
Titan went missing on Sunday as it descended towards the wreckage of the Titanic.
The five men on board are Stockton Rush, British billionaire Hamish Harding, Pakistani businessman Shahzada Dawood and his son Suleman, andFrench submersible pilot Paul-Henri Nargeolet.
Overnight, there were reports of “banging”, but two senior Department of Homeland Security officials told NBC News, Sky’s partner network, that it’s more accurate to talk of “sounds” and “noises”.