How the search for the Titanic sub is unfoldingTo play this video you need to enable JavaScript in your browser.This video can not be playedHow the search for the Titanic sub is unfoldingCloseThe BBC's Jessica Parker looks at what it takes to find the missing submersible.SubsectionUS & CanadaPublished20 June 2023Shareclose panelShare pageCopy linkAbout sharingRead description