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One of the passengers had completed more than 35 dives to the Titanic site and supervised the recovery of over 5,000 artefacts - while another had accompanied former astronaut Buzz Aldrin to the South Pole.
The OceanGate Expeditions sub, Titan, went missing with five people on board near the site of the Titanic on Sunday
British diver Dik Barton has visited the wreck of the Titanic multiple times on board a submersible. He tells Adrienne Arsenault about the perilous journey to visit the Titanic and what might be in store for the missing submersible.
As oxygen levels inside the Titan dwindle, those trapped inside have more than low air supplies to contend with, as a scientific paper reveals. Joe Sommerlad reports
Dik Barton described his 'reliable' friend Paul-Henry Nargeolet as the one in who will be keeping the other four men calm, in order to conserve energy and air and increase their chances of being rescued.