A former Royal Navy submarine captain has defined the potential causes for the "catastrophic implosion" suffered by the Titan submersible on its descent to the wreck of the Titanic.

All 5 folks on board are now believed to have lost their lives in the catastrophe after particles from the vessel was found on Thursday.

"The only positive out of it is that it was instantaneous and they didn't know anything," former captain Ryan Ramsey stated.

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He believes that one in all two issues occurred:

• Hatch with bolts that was used to seal the crew in from the skin suffered a failure that prompted the hull to break down

• Pressure hull itself had a defect that fractured from the strain and prompted the identical end result.

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Asked if the "unusual" design of the Titan was reckless, Mr Ramsey informed Sky News: "I would not go as far as to say reckless.

"I would say disregarding standard ways of building these types of submersible in pursuit of innovation has huge elements of risks and in this case that risk has been realised in the loss of people's lives."

Mr Ramsey, who captained nuclear assault submarine HMS Turbulent, stated that the business will doubtless tighten regulation and shut the potential "loophole" that existed within the case of Titan.

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When requested concerning the security of the sub, Mr Ramsey stated that classes should be realized, and questions stay.

"I think for what's happened here hopefully they will recover some parts of the hull and they will be able to work out whether it was the pressure vessel that likely imploded or whether it was the hatch and they will learn lessons from that."

OceanGate, which owned the Titan submersible, stated that these on board have been "true explorers who shared a distinct spirit of adventure, and a deep passion for exploring and protecting the world's oceans".