A former Royal Navy submarine captain described the outlook for the missing Titan submersible as "bleak" as the oxygen deadline passes. While the search-and-rescue operation continues for Titan, oxygen is thought to have run out aboard the submersible.
The sub lost contact with its mothership on Sunday morning. It had around 96 hours of oxygen on board and, as of Thursday lunchtime, that amount of time has now passed.
Ryan Ramsey told the PA news agency: "The outlook is bleak, that's the only word for it, as this tragic event unfolds and almost the closing stages of where this changes from rescue to a salvage mission. That doesn't mean to say that the current ships and forces deployed won't continue to keep looking.