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Search teams are racing against time to find a tourist submersible that went missing during a dive to the wreck of the Titanic in the North Atlantic. Five people are confirmed to have been on board. Colonel Terry Virts circumnavigated the earth with Hamish Harding, a British billionaire who is one of the missing people. Terry Virts told Newshour's Razia Iqbal that his friend is 'the quintessential British explorer'. (picture: Colonel Terry Virts and Hamish Harding; credit - Terry Virts)