It is unclear what some noises heard close to the wreck of the Titanic really are, the US Coast Guard has stated.
As the seek for the missing Titan submersible continues, Captain Jamie Frederick stated: "We don't know what (the noises) are, to be frank with you."
He additionally revealed that along with yesterday, some additional noises had been heard this morning.
"We're searching in the area where the noises were detected," he stated.
The search space in a distant a part of the Atlantic Ocean has been expanded and is now greater than twice the dimensions of the US state of Connecticut.
Captain Frederick stated they "need to have hope" and that extra distant search gadgets with additional capabilities will arrive tomorrow.
A French submersible robotic that may dive to 6,000 metres could also be there late on Wednesday.
"Our efforts are solely focused on search," Captain Frederick stated, including: "This is a search and rescue operation - 100%."
Latest updates on missing sub
Former Royal Navy commander Chris Parry instructed Sky News he finds tales of "banging" underwater "pretty spurious".
He stated: "You've got Titanic banging away with all its deteriorating structures.
"I've to say, from my very own expertise, utilizing sonobuoys, you realize fairly immediately what the sounds are - whether or not they're the type of factor you are searching 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 is the place she was going, that is the place you begin your search and also you develop 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 possibly be a "wild goose chase", he added.
Sean Leet, chairman of Horizon Maritime Services, which co-wins the Polar Prince analysis vessel which towed Titan, instructed reporters: "The equipment that's been mobilised for this (search) is the finest in the world, the most capable in the world.
"We have to carry out hope. I feel as you are conscious, there's nonetheless life assist obtainable on the submersible, and we'll proceed to carry out hope till the very finish."
Read extra:What are the sonobuoys that picked up underwater noises?Relative says 'sole focus' is rescue of 'beloved' family members
The Titan went lacking on Sunday because it descended in direction of the wreckage of the Titanic.
The 5 males on board are Stockton Rush, British billionaire Hamish Harding, Pakistani businessman Shahzada Dawood and his son Suleman, and French submersible pilot Paul-Henri Nargeolet.
Overnight, there have been stories of "banging", however two senior Department of Homeland Security officers instructed NBC News, Sky's accomplice community, that it's extra correct to speak of "sounds" and "noises".
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