Rescuers may have to contend with huge challenges 12,500ft below the surface of the Atlantic Ocean, an expert tells Sky News.
"The basic problem right up front is there doesn't seem to be a transmitting distress beacon" coming from the Titan submersible, Mr Parry told Sky News.
A search of the seabed where the Titanic lies - around 12,500ft below the surface - will require a specialised submersible craft like an ROV ."It's utterly dark down there, and you have also got a lot of mud and other stuff getting swept up by the propulsors," Mr Parry said.
"Down there you are not dealing with weather at all. What you are dealing with is very strong ocean currents which are pushing you along." In the event the Titan submersible is located on the seabed or deep below the surface it will be difficult to bring those aboard back up safely, Mr Parry said.
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