BBC News: <\/p>\n\n\n\n
US and Canadian search teams are racing against time to find a tourist submarine that went missing during a dive to the Titanic’s wreck on Sunday.<\/strong><\/p>\n\n\n\n Five people were onboard when contact with the small sub was lost about an hour and 45 minutes into its dive.<\/p>\n\n\n\n The rescue operation is continuing overnight in the mid-Atlantic but there has been no sign so far of the vessel.<\/p>\n\n\n\n Government agencies, both countries’ navies and commercial deep-sea firms are all helping the rescue operation.<\/p>\n\n\n\n As of Monday afternoon, it was thought the crew members had roughly four days-worth of oxygen left. Among them is the British billionaire businessman and explorer Hamish Harding.<\/a><\/p>\n\n\n\n “Right now, our focus is getting on as much capability into the area as we can,” Rear Adm John Mauger of the US Coast Guard told a press conference.<\/p>\n\n\n\n Military planes, a submarine and sonar buoys have so far been used in the search for the vessel.<\/p>\n\n\n\n Titanic’s wreck lies some 435 miles (700km) south of St John’s, Newfoundland, though the rescue mission is being run from Boston, Massachusetts.<\/p>\n\n\n\n The US Coast Guard said a research ship called the Polar Prince had conducted a surface search for the sub on Monday evening. It is used to transport submersibles to the wreckage site and was the support ship on Sunday’s tourist expedition.<\/p>\n\n\n\n The missing craft is believed to be tour firm OceanGate’s Titan submersible, which CBS journalist David Pogue travelled aboard last year to reach the wreckage of the Titanic.<\/p>\n\n\n\n