The search for a submersible that went missing during a dive to the wreck of Titanic has entered its fourth day, amid concerns the oxygen supply sustaining its five passengers is running dangerously low.
Equipment from the US, Canada, UK and France is heading to the scene of the search, about 640km (400 miles) south of St John’s, Newfoundland, joining an international coalition of rescue teams that is sweeping a vast expanse of the North Atlantic for the Titan after it went missing on Sunday, nearly two hours into its dive.