One member of the audience asked what would happen to jobs in Scotland if the Trident nuclear deterrent were moved, as the topic of debate turns to Scotland in the World.
Mr Salmond points out that the SNP would make "Faslane the centre of Scottish defence forces" which he claims "will create jobs".
He says the British government is "wasting money on weapons of mass destruction that can't be used".
Mr Darling counters: "I think we can ill afford to lose another 8,000 jobs from the Clyde and the west of Scotland" if Trident was moved to England.
With just a few weeks to go until the Scottish independence referendum takes place, here are some key facts about the vote.
An investigation has been launched after listings appeared on eBay offering to sell votes in the upcoming Scottish independence referendum.
Bounce for leaving the union following second debate this week, but only 43% expected to vote yes in referendum on September 18