Admiral Sir James Burnell-Nugent, former Commander-in-Chief Fleet of the Royal Navy, told Sky News that "the nature of the announcement suggests this debris is in some way connected with the Titan".
A rescue expert says the debris found in the search for Titan was "a landing frame and a rear cover from the submersible".
David Mearns, who is friends with two of the passengers on board Titan, says he is part of a WhatsApp group involving The Explorers Club.
Mr Mearns told Sky News the president of the club, who is "directly connected" to the ships on the site, said to the group: "It was a landing frame and a rear cover from the submersible."
Mr Mearns says: "Again this is an unconventional submarine, that rear cover is the pointy end of it and the landing frame is the little frame that it seems to sit on."
He says this confirms that it is the submersible.
Mr Mearns says he knows both British billionaire Hamish Harding and the French sub pilot Paul-Henri Nargeolet.
"It means the hull hasn't yet been found but two very important parts of the whole system have been discovered and that would not be found unless its fragmented," he added.
Mr Mearns also spoke about the fairing of the submarine - shaped like a fishtail - and said: "If the faring is off and the frame is off - then something really bad has happened to the entire structure".
"On the news that we have yet, they haven't found the hull of which the men are inside".
A rescue expert says the debris found in the search for Titan was "a landing frame and a rear cover from the submersible".
David Mearns, who is friends with two of the passengers on board Titan, says he is part of a WhatsApp group involving The Explorers Club.
Mr Mearns told Sky News the president of the club, who is "directly connected" to the ships on the site, said to the group: "It was a landing frame and a rear cover from the submersible."
Mr Mearns says: "Again this is an unconventional submarine, that rear cover is the pointy end of it and the landing frame is the little frame that it seems to sit on."
He says this confirms that it is the submersible.
Mr Mearns says he knows both British billionaire Hamish Harding and the French sub pilot Paul-Henri Nargeolet.
"It means the hull hasn't yet been found but two very important parts of the whole system have been discovered and that would not be found unless its fragmented," he added.
Mr Mearns also spoke about the fairing of the submarine - shaped like a fishtail - and said: "If the faring is off and the frame is off - then something really bad has happened to the entire structure".
"On the news that we have yet, they haven't found the hull of which the men are inside".