Missing sub: 'It would have been immediate - milliseconds', says friend of passengers

David Mearns a rescue expert who knows two of the passengers on board Titan says "they don't use phrases like debris field unless there's no chance of a recovery of the men alive".

Speaking about if there had been an implosion, he said: "The only saving grace is that it would have been immediate, literally in milliseconds and the men would have no idea what was happening."

Follow live updates here: https://news.sky.com/story/titanic-submarine-missing-live-updates-submersible-cannot-be-opened-from-inside-time-running-out-on-oxygen-supply-waiver-mentions-death-three-times-12905748

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